题目列表(包括答案和解析)
NASA’s twin Mars rovers, Spirit and Opportunity, have been exploring the Red Planet since 2004. But a little more than a year ago, NASA lost contact with Spirit. The space agency has tried several ways to make contact with the rover, but Spirit has not sent back any signals.
Spirit landed on Mars on January 4, 2004. Three weeks later, Opportunity arrived. Soon after, the rovers went to the opposite side of Mars. Spirit’s original mission was only designed to last for three months, but Spirit has worked for more than five years doing additional missions. Both rovers have made important discoveries about ancient Mars. They have taken thousands of images and found evidence in the rocks of a water, warmer past in Mars’ history.
Spirit is solar-powered. It got stuck in a sand trap in April 2009, trapped deep into the soil and with its wheels turning around and around but not able to move forwards or backwards. Spirit had to agree that there is nothing that can be done to change the situation—it’s never going to move again. However, even if it is a not moving station, it can still study the planet’s atmosphere and deep interior.
NASA has been concentrating on trying to position its solar panels to get as much energy from the sun as
possible, or to get the rover leaning in a manner that will allow the most amount of sunlight falling on its solar panels, in order to keep it alive during the coming winter months. Engineers have planned to rock the vehicle back and forth to acquire a more favorable position. However, no matter how many efforts have been made, Spirit still could not get out of the soft soil and could not lean itself toward the sun as the Martian winter approached. Without enough
energy reaching its solar panels and with so little energy in its batteries, it went into hibernation, just like a polar bear, and has not communicated with Earth since March 22, 2010.
Whatever the future holds for Spirit, its mission has been an outstanding success. When it landed on the Red Planet in January 2004, no one was really sure how long it would continue working in the cold and dusty environment. As a matter of fact, three months was its original goal.
After so many fruitless efforts, NASA scientists are losing hope of ever reconnecting with Spirit, but they will give it one more try. Ground controllers are contacting Spirit over a range of frequencies and at different times during the day in case its internal clock stopped working and it lost track of time. They also are commanding the rover to turn on its backup radio transmitter in case the main one is dead.
If this final effort to connect isn’t successful, NASA will shift the focus to its twin robot, Opportunity, which is in a different part of Mars. Opportunity is still on the move and continues to travel freely to this day. It has traveled 16.6 miles so far, and is currently rolling towards another crater it has yet to explore.
NASA has spent more than $900 million on the project but shows no sign of giving up on these determined and hard-working robots. The rovers are, though, experiencing gradual wear and tear, the expected damage to something caused by using it repeatedly over a period of time. Even before Spirit got trapped, one of its wheels had failed. And NASA says it’s just a matter of time before both robots break down completely.
【小题1】According to the passage, what can we know about Spirit?
| A．It had explored Mars several times. |
B．Its original mission was to work for five years. |
| C．It landed on Mars three weeks later than Opportunity. |
| D． It discovered that Mars was once a warm and wetter place. |
| A．Try to lean Spirit to make it get as much sunlight as possible. |
| B．Rock Spirit back and forth to make it acquire a more favorable position. |
| C．Make efforts to help Spirit get out of the soft soil where it is stuck. |
| D．Contact and order Spirit to turn on its backup radio transmitter. |
| A．it didn’t have enough energy | B．it had finished its task |
| C．something was wrong with its wheels | D．it met an unidentified creature |
| A．NASA will move the center of Spirit out of the sand |
| B．NASA will depend on Opportunity to do the exploration |
| C．NASA will do nothing but wait for some opportunity |
| D．NASA will make opportunity help Spirit |
| A．NASA has planned to spend more money on Spirit |
| B．Spirit will be brought back to Earth |
| C．Spirit will stop operating totally in the future |
| D．Spirit will cause damage to Mars |
| A．NASA makes the last effort to contact Spirit. |
| B．Spirit has made many important discoveries on Mars. |
| C．How Spirit got stuck and couldn’t move on Mars. |
| D．Why NASA tried many ways to contact Spirit. |
NASA’s twin Mars rovers, Spirit and Opportunity, have been exploring the Red Planet since 2004. But a little more than a year ago, NASA lost contact with Spirit. The space agency has tried several ways to make contact with the rover, but Spirit has not sent back any signals.
Spirit landed on Mars on January 4, 2004. Three weeks later, Opportunity arrived. Soon after, the rovers went to the opposite side of Mars. Spirit’s original mission was only designed to last for three months, but Spirit has worked for more than five years doing additional missions. Both rovers have made important discoveries about ancient Mars. They have taken thousands of images and found evidence in the rocks of a water, warmer past in Mars’ history.
Spirit is solar-powered. It got stuck in a sand trap in April 2009, trapped deep into the soil and with its wheels turning around and around but not able to move forwards or backwards. Spirit had to agree that there is nothing that can be done to change the situation—it’s never going to move again. However, even if it is a not moving station, it can still study the planet’s atmosphere and deep interior.
NASA has been concentrating on trying to position its solar panels to get as much energy from the sun as possible, or to get the rover leaning in a manner that will allow the most amount of sunlight falling on its solar panels, in order to keep it alive during the coming winter months. Engineers have planned to rock the vehicle back and forth to acquire a more favorable position. However, no matter how many efforts have been made, Spirit still could not get out of the soft soil and could not lean itself toward the sun as the Martian winter approached. Without enough energy reaching its solar panels and with so little energy in its batteries, it went into hibernation, just like a polar bear, and has not communicated with Earth since March 22, 2010.
Whatever the future holds for Spirit, its mission has been an outstanding success. When it landed on the Red Planet in January 2004, no one was really sure how long it would continue working in the cold and dusty environment. As a matter of fact, three months was its original goal.
After so many fruitless efforts, NASA scientists are losing hope of ever reconnecting with Spirit, but they will give it one more try. Ground controllers are contacting Spirit over a range of frequencies and at different times during the day in case its internal clock stopped working and it lost track of time. They also are commanding the rover to turn on its backup radio transmitter in case the main one is dead.
If this final effort to connect isn’t successful, NASA will shift the focus to its twin robot, Opportunity, which is in a different part of Mars. Opportunity is still on the move and continues to travel freely to this day. It has traveled 16.6 miles so far, and is currently rolling towards another crater it has yet to explore.
NASA has spent more than $900 million on the project but shows no sign of giving up on these determined and hard-working robots. The rovers are, though, experiencing gradual wear and tear, the expected damage to something caused by using it repeatedly over a period of time. Even before Spirit got trapped, one of its wheels had failed. And NASA says it’s just a matter of time before both robots break down completely.
50. According to the passage, what can we know about Spirit?
A. It had explored Mars several times.
B. Its original mission was to work for five years.
C. It landed on Mars three weeks later than Opportunity.
D. It discovered that Mars was once a warm and water place.
51. According to the passage, which of the following is NOT what NASA did?
A. Try to lean Spirit to make it get as much sunlight as possible.
B. Rock Spirit back and forth to make it acquire a more favorable position.
C. Make efforts to help Spirit get out of the soft soil where it is stuck.
D. Contact and order Spirit to turn on its backup radio transmitter.
52. The reason why Spirit failed to communicate with the Earth is that ________.
A. it didn’t have enough energy B. it had finished its task
C. something was wrong with its wheels D. it met an unidentified creature
53. By saying “NASA will shift the focus” in Paragraph 7, the author means that ______.
A. NASA will move the center of Spirit out of the sand
B. NASA will depend on Opportunity to do the exploration
C. NASA will do nothing but wait for some opportunity
D. NASA will make opportunity help Spirit
54. The last paragraph mainly informs us that _______. Ks5u
A. NASA has planned to spend more money on Spirit
B. Spirit will be brought back to Earth
C. Spirit will stop operating totally in the future
D. Spirit will cause damage to Mars
55. What’s the text mainly about?
A. NASA makes the last effort to contact Spirit.
B. Spirit has made many important discoveries on Mars.
C. How Spirit got stuck and couldn’t move on Mars.
D. Why NASA tried many ways to contact Spirit.
Economics has long been known as an unpleasant science. But is any economist so dull as to criticize Christmas? At first glance, the holiday season in western economies seems a treat for those who are concerned with such things as GDP growth. After all, everyone is spending; in America, sellers make 25 % of their yearly sales and 60 % of their profits between Thanksgiving and Christmas. Even so, economists find something to worry about in the nature of the purchases being made.
Much of the holiday spending is on gifts for others. At the simplest level, giving gifts involves the giver's thinking of something that the receiver would like — he tries to guess her preferences, as economists say — and then buying the gift and delivering it. Yet this guessing of preferences is often done badly. Every year, ties go unworn and books unread. And even if a gift is enjoyed, it may not be what the receiver would have bought if they had spent the money themselves.
Interested in this mismatch between wants and gifts, in 1993 Joel Waldfogel, then an economist at Yale University, attempted to estimate the disparity(差距) in dollar terms. He asked students two questions at the end of a holiday season: first, estimate the total amount paid (by the givers) for all the holiday gifts you received; second, apart from the emotional value of the items, if you did not have them, how much would you be willing to pay to get them? His results were unpleasant: on average, a gift was valued by the receiver well below the price paid by the giver.
The most conservative(保守的) estimate put the average receiver’s valuation at 90% of the buying price. The missing 10% is what economists call a deadweight loss; a waste of resources that could be avoided without making anyone poorer. In other words, if the giver gave the cash value of the purchase instead of the gift itself, the receiver could then buy what she really wants and be better off for no extra cost. It suggests that in America, where givers spend $40 billion on Christmas gifts, $ 4 billion is being lost annually in the process of gift giving. Add in birthdays, weddings and non Christian occasions, and the figure would balloon. So should economists call for an end to gift giving, or at least press for money to become the gift of choice?
56. Why do some people regard the holiday season in western economies a treat?
A. Because the economic situation in US has been depressing.
B. Because American sellers make a quarter of their yearly sales through holiday season.
C. Because holiday spending can speed up GDP growth.
D. Because sellers can make as much profit as 60 % over holiday season.
57. What's the main idea for the second paragraph?
A. In many cases the gifts cannot meet the receivers’ needs.
B. The purchases made over holiday season are actually a waste of money.
C. It's really not easy to guess the others’ preferences.
D. Much of the holiday spending is on gifts for others.
58. The purpose of Joel Waldfogel's study is to _____.
A. prove the mismatch between wants and gifts
B. estimate the disparity between wants and gifts in economic terms
C. spark new ideas of economic studies on holiday spending
D. discover the exact cost of holiday spending on gift giving
59. Economists think of the misusing 10% of holiday spending as a deadweight loss because
_______.
A. the cash value of the purchase is lower than the buying price
B. it is actually a waste of resources in economic terms
C. with the money the receivers can be better off for no extra cost
D. it makes many people even poorer for spending more on unwanted gifts
60. According to the passage altogether how much money is wasted every year on gift giving?
A. About $4 billion. B. About 10% of the total value.
C. About $40 billion. D. Much more than $4 billion.
Last year, a report by a committee of education experts said that a lot of American students cannot write well. The report noted the concerns of business leaders and teachers. The experts said that more students should have to pass a writing test before they can finish high school. They pointed out that major college entrance tests are changing now to include a writing part.
Educators know that teaching students to write well is not easy. One problem is the amount of time needed to read through large amounts of work. So some companies have developed computer programs. These can grade student writing much more quickly than a person can. Writing tests can also cost less to carry out by computer than paper-and-pencil. These computer systems are known as e-readers. They use artificial (人工的) intelligence to think in a way like teachers. In the state of Indiana, computer grading of a statewide writing test began with a test of the system itself. For two years, both a computer and humans graded the student writing. Officials say there was almost no difference between the computer grades and those given by the human readers.
The entrance test commonly used by business schools, the GMAT, already uses e-readers. The GRE and TOEFL tests might start; officials are deciding. The GRE is the Graduate Record Examination. TOEFL is the Test of English as a Foreign Language.
Systems are also being used to grade writing in college classes. The computers read a few hundred examples of student writing already graded by humans. Then the systems compare new writings against those already examined.
How do teachers feel all about this? Many say machines can never do the job as well as people can. A computer can find spelling and grammar mistakes. But these teachers say it can never really understand what a writer is trying to say. Critics say a program cannot follow a thought or judge humor or understand a beautifully expressed idea.
But inventors of the programs say computer grading guarantees that each piece of writing is graded in the same way. They also say the systems are meant to judge knowledge more than creativity.
What do the teachers think of the computer system?
A. They think highly of the computer systems.
B. They think that computers cannot grade writing as well as people.
C. They believe that computers can understand a writer’s idea well
D. They are glad computers will spare their effort to correct students’ school work.
From the first paragraph we can conclude that _________.
A. American students’ writing ability is being improved
B. American students’ writing ability is not satisfactory
C. business leaders and teachers are not worried about students’ writing
D. all college entrance tests will include a writing part
Which of the following is NOT the advantage of e-readers?
A. Saving much of teachers’ time. B. Saving a lot of money.
C. Being fair and objective. D. Appreciating humor and beauty
The best title of this passage might be _________.
A. Computer-graded Writing B. Human-graded Writing
C. How to Improve Students’ Writing D. Advantages of E-readers
III. Reading Comprehension (40’)
Section A
Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.
Imagine waking up one morning to discover all your personal information in your mobile phone has been stolen. Your messages have been infected with a virus that has sent itself to all the people you have ever ___48___ messages with. You try to make a call but your mobile phone's address book has been deleted. What is ___49___ is that you turn on your phone, only to find your screen back. Nowadays, Computer hackers, who have long focused on computers, have now got their ___50___ on mobile phones. A phone virus programme can make your phone do things you have no control over. It might control the White House or the police. Or it could ___51___ eat into the phone's operating software, turning it off and erasing your personal information.
With mobile phones functioning more like computers, it’s no ___52___ that hackers and virus writers have the phones in their sights. Now that the mobile phone is a small computer with memory, important data and an ___53___ to the Internet, these devices should be protected equally and carefully. ___54___, it seems that the phone users have done nothing more to protect their phones and viruses have already made mobile phone owners ___55___ in Asia. A virus can get messages and send them elsewhere. And it can record your password. People are now ___56___ of surfing the Net, send emails and download software with their mobiles, so they are an easy target for the same hackers who have kept sending viruses to computers over the past two ___57___.
In China, the mobile of a certain ___58___ kept sending a huge amount of messages automatically and secretly, which made her pay a lot of extra money reluctantly. In Japan, if you opened an email message on your mobile, it would cause the phone to repeatedly ___59___ the national emergency number. So phone operators had to cancel emergency calls until the fault was removed. Some experts say that mobile users can ___60___ viruses, of course, by sticking to their traditional phones without Web links, while some others advise users to make Bluetooth invisible, delete all unsolicited messages without opening them, always say “___61___” if your phone asks to install a program that you are not ___62___ with and install only software from safe websites as much as possible
48. A. sent B. received C. exchanged D. contacted
49. A. important B. wonderful C. worse D. serious
50. A. hands B. viruses C. control D. temptation
51. A. extensively B. absolutely C. regularly D. simply
52. A. need B. wonder C. use D. possibility
53. A. affection B. access C. address D. admission
54. A. However B. Therefore C. Furthermore D. Somehow
55. A. amazed B. terrified C. amused D. surprised
56. A. capable B. possible C. able D. mobile
57. A. weeks B. centuries C. years D. decades
58. A. hacker B. businessman C. lady D. gentleman
59. A. call B. ring C. attack D. dial
60. A. copy B. delete C. avoid D. recognize
61. A. yes B. hello C. sorry D. no
62. A. satisfied B. familiar C. delighted D. Happy
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