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Scientists have found what look like caves on Mars, and say they could be protecting life from the planet’s terrible environment.
The first caves appear as seven mysterious black dots (点) on the pictures which were sent back by NASA’s Mars Odyssey orbiter. Each as large as a football field, they may be openings into natural caves below the Martian surface.
“If there is life on Mars, there is a good chance that you’d find it in caves,” said Jut Wynne, one of the researchers who noticed the features (特征) while working on a US Geological Survey Mars Cave Detection Program.
Jonathan Clarke, a geologist with the Mars Society of Australia, yesterday described the discovery as exciting.
One photo taken at night by an infrared imager(红外线成像器) showed one hole to be unusually warm, suggesting hot air may be flowing out.
“I said: ‘Wow, that’s a cave’” Dr. Clarke said excitedly. “People have been looking for these for a long time; now we have found them.”
He agreed such caves could be perfect places to search for life escaping from the bitterly cold, radiation-soaked(充满辐射的), dry surface.
“Tiny drops of water could collect inside,” he said. “If there are gases coming out, they could provide energy for a whole range of bacteria (细菌). A cave is also a protection from radiation; the surface of Mars is exposed to high levels of space radiation.”
The caves probably formed when tube-shaped lava flows(管状岩浆流) spread across the planet long ago. The outside of the tubes cooled, forming solid walls, while something hotter inside allowed the remaining to flow out, forming caves.
小题1: What does the passage mainly talk about?
A.How the caves were formed on Mars.
B.How NASA sent the pictures back to earth
C.Caves on Mars may be full of hot air or a sign(迹象)of life.
D.Scientists have completely recognized the surface of Mars.
小题2: We can learn from the passage that __________.
A.water has already been found on Mars
B.the scientists found all the caves at night
C.it is certain that there is life in these caves
D.the surface of Mars is bitterly cold, radiation-soaked and dry
小题3: According to the passage, Dr. Clarke was so excited because ________.
A.such caves could provide energy for life
B.they had finally found the caves on Mars
C.such caves would be perfect places to search for life
D.There would be life on Mars.
小题4: Necessary conditions for life on Mars mentioned in the passage may include_________.
A.lava and energyB.water and radiation from space
C.gases and lavaD.water and protection from radiation
小题5: what does the underlined word “ the planet” in paragraph 1 refer to?
A.the MarsB.the earthC.the cavesD.radiation
小题1:C小题1:D小题1:B小题1:D小题1:A
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科目:高中英语 来源:不详 题型:阅读理解

A new study has found that it may be possible to train people to be more intelligent, increasing the brainpower they had at birth.
Until now,it has been widely assumed that the kind of mental ability that allows us to solve new problems without having any relevant previous experience—what psychologists call fluid intelligence—is innate and cannot be taught(though people can raise their grades on tests of it by practicing).
But in the new study,researchers describe a method for improving this skill,along with experiments to prove it works.
The key, researchers found, was carefully structured training in working memory—the kind that allows memorization of a telephone number just long enough to dial it.This type of memory is closely related to fluid intelligence,so the researchers reasoned that improving it might lead to improvements in fluid intelligence.
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The four groups experienced a half-hour of training daily for 8, 12, 17 and 19 days, respectively.To make sure they were not just improving their test-taking skills,the researchers compared them with control groups that took the tests without the training.
The results, published Monday in The Proceedings of the National Academy of Sciences,were striking.Improvement in the trained groups was a lot greater.Moreover,the longer they trained, the higher their scores were.All performers,from the weakest to the strongest,showed significant improvement.
“Our results show you can increase your intelligence with proper training.” said Dr Jaeggi, a co-author of the paper.“No one knows how long the gains will last after training stops,” he added, “and the experiment’s design did not allow the researchers to determine whether more training would continue to produce further gains.”
小题1:.The researchers thought the key to improving the intelligence was ______________.
A.memorizing telephone numbersB.improving working memory
C.training in concentrationD.recalling a card
小题2:.The following aspects of the training help increase intelligence EXCEPT___________.
A.ignoring irrelevant itemsB.monitoring ongoing performance
C.managing two tasks at the same timeD.using previous experience
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A.trained the four groups for the same period of time
B.only made comparisons between the four groups
C.compared the four groups with control groups
D.trained the four groups together
小题4:.By writing the article,the writer intends to ______________.
A.inform the readers of a new study
B.call on people to be trained to increase intelligence
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科目:高中英语 来源:不详 题型:阅读理解

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科目:高中英语 来源:不详 题型:阅读理解

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科目:高中英语 来源:不详 题型:阅读理解

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科目:高中英语 来源:不详 题型:阅读理解

US bees operation keeping groups have been attacked seriously by so called Colony Collapse Disorder (蜂群衰竭失调).Almost 1/2 of their worker bees have vanished during the past season.This disorder has also been reported in Israel, Europe and South America.Bees fly away from the hive and never return.Sometimes they are found dead; other times they are never found.Many crops and trees depend on pollination--- by bees to help them grow. 
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And some researchers suspect that bee production in the United States is down mainly because of the weather.Honey bees gather nectar from flowers and trees.The sweet liquid gives them food and material to make honey.But cold weather this spring in the Midwest reduced the flow of nectar in many flowers.Many bees may have starved.Dry weather in areas of the country could also be playing apart.
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D.following the time order
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A.American bees are more likely to defend themselves against hurt from other insects than Australian ones
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科目:高中英语 来源:不详 题型:阅读理解

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B.preventing a victim’s condition from getting worse.
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B.to refer to all kinds of handbooks on first aid
C.to remove the ring or bracelet he/she may be wearing
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A.remove him from the accident sceneB.turn him over
C.call for professional medical helpD.examine him carefully
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A.the importance of protecting the accident scene
B.some basic facts about first aid
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