If two scientists at Los Alamos National Laboratory are correct, people will still be driving gasoline-powered cars 50 years from now, giving out heat-trapping carbon dioxide into the atmosphere — and yet that carbon dioxide will not contribute to global warming.

In a proposal by two scientists, vehicle emissions (排放) would no longer contribute to global warming. The scientists, F. Jeffrey Martin and William L. Kubic Jr., are proposing a concept, which they have named Green Freedom, for removing carbon dioxide from the air and turning it back into gasoline.

The idea is simple. Air would be blown over a liquid solution (溶液) of potassium carbonate, which would absorb the carbon dioxide. The carbon dioxide would then be put to chemical reactions that would turn it into fuel: gasoline or jet fuel.

This process could change carbon dioxide from an unwanted, climate-changing pollutant into a vast resource for renewable fuels. The cycle — equal amounts of carbon dioxide produced and removed — would mean that cars, trucks and airplanes using the synthetic (合成的) fuels would no longer be contributing to global warming.

Although they have not yet built a synthetic fuel factory, or even a small model, the scientists say it is all based on existing technology. “Everything in the concept has been built, is operating or has a close cousin that is operating,” Dr. Martin said.

The Los Alamos proposal does not go against any laws of physics, and other scientists who have independently suggested similar ideas. Dr. Martin said he and Dr. Kubic had worked out their concept in more detail than previous proposals.

There is, however, a major fact that explains why no one has built a carbon-dioxide-to-gasoline factory: it requires a great deal of energy.

According to their analysis, their concept, which would cost about $5 billion to build, could produce gasoline at an operating cost of $1.40 a gallon and would turn economically practical when the price at the pump hits $4.60 a gallon.

Other scientists said the Los Alamos proposal perhaps looked promising but could not evaluate it fully because the details had not been published.

“It’s definitely worth pursuing,” said Martin I. Hoffert, a professor of physics at New York University. “It’s not that new an idea. It has a couple of pieces to it that are interesting.”

67. What is the idea of the project being discussed in the article?

A. Recycling the carbon dioxide from cars back into gasoline.

B. Create a new gasoline that gives off very little carbon dioxide.

C. Using a special liquid solution to absorb carbon dioxide from cars.

D. Build synthetic fuel factories to remove carbon dioxide from the air.

68. What’s the name given to the new concept?

A. Synthetic Fuel.                                 B. Green Freedom.    

C. Renewable Fuel.                                D. Carbon-dioxide-to-gasoline Factory.

69. Which of the following is NOT one of the benefits of this new concept as suggested in the article?

A. Reduction of global warming.            B. Cheaper gasoline for cars.

C. Longer life of cars.                     C. Less pollution of the atmosphere.

70. What’s the biggest problem in realizing the concept according to the report?

A. Shortage of starting funds.         B. Immature technology involved.

C. All previous similar attempts have failed.

D. The use of too much energy in running the fuel factory.

A Good Teacher is a Strict Teacher

    One of the most important parts in the healthy development of a

child is played by education. But the way in which education is

understood has changed completely, as we must not forget that

the severe and unfeeling way of bringing up a child in the past

was primarily based on cruel grounding（基础）and strict

rules that were supposed to create accomplished individuals, the typical gentlemen. Nowdays,

society is much more open-minded and it does not put a great value on being strict, although this

doesn’t mean that opinions regarding this subject do not differ.

    On the one hand, there are also people who believe that there has got to be a bound between

teacher and student if any satisfying results are awaited. Luckily for us, more and more teachers are

understanding this fact and are doing their best to get over the strict rules and get in touch with us.

    My opinion is that only by having a friendly attitude and accepting other opinions, especially

those of your pupils, you are truly able to do your job at high standards. However, this does not

mean that a teacher shouldn’t be a bit more rough when he feels that things are getting out of hand.

All in all, I must say that a good teacher is the teacher that has the ability to be kind and strict at the

same time, thus achieving to gain his students respect and interest.

The aim of education in the past was to      .

       A．create perfect persons      B．create open-minded persons

       C．bring up a child              D．build a cruel grounding

According to the passage, the narrow-minded people think      .

       A．a pupil is always interested in what he is learning

       B．a pupil himself will improve his studies

       C．children should be made to study

       D．children don’t like a rough hand

The underlined word “job” in the last paragraph can be replaced by      .

       A．controlling       B．teaching    C．learning    D．punishing

The author thinks a good teacher should be     .

       A．kind and strict         B．skilled and clever

       C．rough and cruel              D．friendly and practical

It can be inferred from the passage that       .

       A．society is much more open-minded and being strict is out date

       B．as long as the teachers are strict with students, the students will certainly get good marks

       C．most people are in favor of strict teachers because they have strict grounding and strict rules

       D．if we expect students to develop in a healthy way, the good relationship between teachers and students is important

A Good Teacher is a Strict Teacher

    One of the most important parts in the healthy development of a

child is played by education. But the way in which education is

understood has changed completely, as we must not forget that

the severe and unfeeling way of bringing up a child in the past

was primarily based on cruel grounding（基础）and strict

rules that were supposed to create accomplished individuals, the typical gentlemen. Nowdays,

society is much more open-minded and it does not put a great value on being strict, although this

doesn’t mean that opinions regarding this subject do not differ.

    On the one hand, there are also people who believe that there has got to be a bound between

teacher and student if any satisfying results are awaited. Luckily for us, more and more teachers are

understanding this fact and are doing their best to get over the strict rules and get in touch with us.

    My opinion is that only by having a friendly attitude and accepting other opinions, especially

those of your pupils, you are truly able to do your job at high standards. However, this does not

mean that a teacher shouldn’t be a bit more rough when he feels that things are getting out of hand.

All in all, I must say that a good teacher is the teacher that has the ability to be kind and strict at the

same time, thus achieving to gain his students respect and interest.

The aim of education in the past was to      .

       A．create perfect persons      B．create open-minded persons

       C．bring up a child              D．build a cruel grounding

According to the passage, the narrow-minded people think      .

       A．a pupil is always interested in what he is learning

       B．a pupil himself will improve his studies

       C．children should be made to study

       D．children don’t like a rough hand

The underlined word “job” in the last paragraph can be replaced by      .

       A．controlling       B．teaching    C．learning    D．punishing

The author thinks a good teacher should be     .

       A．kind and strict         B．skilled and clever

       C．rough and cruel              D．friendly and practical

It can be inferred from the passage that       .

       A．society is much more open-minded and being strict is out date

       B．as long as the teachers are strict with students, the students will certainly get good marks

       C．most people are in favor of strict teachers because they have strict grounding and strict rules

       D．if we expect students to develop in a healthy way, the good relationship between teachers and students is important

    A recent announcement by scientists that they have successfully cloned the first human embryo has caused much debate and has shocked many people around the world. On the one hand，some scientists point out that if you clone an embryo，you can produce valuable tissues(组织）and organs that could be used to save human lives. On the other hand，many people，including some scientists, disagree and fear that if mankind interferes with（干涉）nature in this way，they may be on their way to producing a real-life Frankenstein’s monster.

    Cloning is producing an exact copy of a plant or an animal using its cells. The first mammal to be cloned successfully from an adult cell was Dolly the sheep. She was born in 1996 and died in early 2003，at a much younger age than normal. When she was born，many people were angry because they thought cloning would create more disease in the animal world. However，in general the scientists were praised for their wonderful scientific breakthrough.

    The Scottish scientist who created Dolly，Ian Wilmut，is shocked that some scientists are now considering cloning human beings. Although he researches cloning，his intention has never been to create copies of humans. Instead，he thinks research efforts should concentrate on creating new tissues and organs that could eventually be used to cure diseases like cancer. However，some people consider that cloning human embryos with the intention of destroying them shows no respect for human life.

    While cloning human embryos is illegal in many countries，some scientists are already pushing ahead with research so as to deliver a cloned human baby. Severino Antinori，an Italian doctor，is one of the leaders in this kind of research. He has declared that he wants to be the first to clone a human being.

    In China，scientists have focused their efforts on cloning animals，as well as stern cells to be used in medical research. China has succeeded in producing clones of cows and goats，and continues to research ways in which cloning can benefit mankind.

51. Which of the following statements about cloning is TRUE according to the passage?

A. Cloning technology can only be applied to animals.

B. A cloned animal can live longer than a normal one.

C. People all over the world are happy about the birth of Dolly.

D. Cloning can produce valuable tissues and organs to cure human diseases.

52. The reasons why people are anti-cloning include the following EXCEPT that_______.

A. cloning may produce a real-life Frankenstein’s monster

B. cloning might create more disease in the animal world

C. cloning can’t help those who want to clone their dead children

D. cloning human embryos shows no respect for human life

53. Who is in favor of cloning human beings?

A. Ian Wilmut.        B. Severino Antinori.

C. The author.        D. The Chinese scientists.

54. What can be inferred from the last two paragraphs?

A. If we interfere with nature, we will change the world to be what we want.

B. It is impossible to clone babies for women who cannot have ones.

C. Cloning human beings is illegal in many countries，so no scientists want to do so.

D. Whether cloning human embryos is legal or not remains a matter of debate.

D
　　In the atmosphere,carbon dioxide actd rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun's rays to enter but prevents the heat from excaping.
　　According to a weather expert's prediction,the atmosphere will be 3 warmer in the year 2050 than it is today, if man continues to burn luels at the present rate. If this warming up took place,the ice caps in the poles would begin to melt,thus raising sea level several meters and severely flooding coastal cities.Also，the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere(半球),psooicbly resulting in an alteration of earth's chief food growing zones.
　　In the past,concern about a man - made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet.But the weather experts are now paying more attention to West Antarctic,which may be affected by a warming on the scale that will possibly take place in the next fifty years from on burning of fuels.
　　Satellite pictures showthat large areas of Antarctic ice are already disappearing.The evidence available suggests that a warming has taken place.This fits the theory that carbon dioxide warms the earth.
　　However,most of the fuel is burnt in the northern hemisphere,where temperatures seem to be falling.Scientists conclude,therefore,that up to now natural influences on the weather have exceeded those caused by man.The question is:Which natural cause has most effect on the weather?
　　One possibility is the variable behavior of the sun.Astronomers at one research station have studied the hot spots and cold spots(that is,the relatively less hot spots) on the sun. As the sun rotates(旋转),every 27.5 days,it presents hotter or colder faces to the earth,and different aspects to different parts of the earth.This seems to have a considerable effect on the distribution of the earth's atmospheric pressure,and consequently on wind circulation.The sun is also variable over a long term:its heat output goes up and down in cycles,the latest trend being downward.
　　Scientists are now finding mutual relations between models of solar weather interactions and the actual climate over many thousands of years ,including the last Ice Age.The problem is that the models are predicting that the world should be entering a new Ice Age and it is not.
　　One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia(不活动，惰性) of the earth's climate.If this is right,the warming effect of carbon dioxide might thus be serving as a useful counter balance to the sun's diminishing heat.
　　68.It can be concluded that a concentration of carbon dioxide in the atmosphere would ___.
　　　A.mean a warming - up im the Arctic
　　　B.raise the temperature of the earth's surface
　　　C.prevent the sun's rays from reaching the earth's surface
　　　D.account for great changes in the climate in the northern hemiphere
　　69.Although the fuel consumption is greater in the northern hemisphere,temperatures there seem to be falling.This is _______.
　　　A.mainly because the levels of carbon dioxide are rising
　　　B.partly due to variations in the output of solar energy
　　　C.possibly because the ice caps in the poles are melting
　　　D.exclusively due to the effect of the inertia of the earth's climate
　　70.On the basis of their models,scientists are of the opinion that ________.
　　　A.the climate of the world should be becoming cooler
　　　B.the new Ice Age will be delayed by the greenhouse effect
　　　C.the man - made warming effect helps to increase the solar effects
　　　D.it will take thousands of years for the inertia of the earth's climate to take effect