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  US researchers have found traces of an ancient lake on Mars recently, increasing hopes of discovering evidence that billions of years ago the Red planet hosted life.

  The lake, which dates back some 3.4 billion years, appears to have covered as much as 80 square miles and was up to 1,500 feet deep, said the team from the University of Colorado.

  “This is the first clear evidence of shorelines on the surface of Mars,”said Boulder’ s research associate, Gaetano Di Achille, in a study published in the latest edition of Geophysical Research Letters.

  “The identification of the shorelines and accompanying geological evidence allows us to calculate the size and volume of the lake, which appears to have formed about 3.4 billion years ago.”

  Analysis of the images has shown the water carved out the canyon(溪谷)in which it was found, which then opened out into a valley depositing(使淤积)sediment(沉积)which formed a delta(三角洲).

  “Finding shorelines is a great discovery to us,” said assistant professor Brian Hynek, adding it showed the lake existed at a time when Mars was thought to have been cold and dry.

  Scientists believe the oldest surfaces on Mars formed during the wet and warm era known as the Noachan epoch, about 4.1 billion to 3.7 billion years ago.

  The newly discovered lake is believed to date from the Hesperian era and postdates the end of the warm and wet period on Mars by 300 million years, according to the study.

  Scientists believe deltas next to the lake may well hold secrets about past life on Mars as such places on Earth have become the natural deposits of organic carbon and other markers of life.

(1)

The size of the lake found on Mars is _________.

[  ]

A.

80 square miles

B.

1,500 square miles

C.

3.4 billion square miles

D.

300 million square miles

(2)

When the lake existed, the weather on Mars was _________.

[  ]

A.

hot and wet

B.

wet and warm

C.

cold and dry

D.

cold and wet

(3)

Why do scientists think deltas near the lake may hold secrets about past life on Mars?

[  ]

A.

Because similar places on Earth have become natural deposits of markers of life.

B.

Because someone has put secrets about past life on Mars there.

C.

Because past life has been found in other deltas on Mars.

D.

Because some people are said to have already seen life marks there.

(4)

Which of the following statements is NOT true according to the passage?

[  ]

A.

The Noachan epoch was a wet and warm era.

B.

The lake might have existed 3.4 billion years.

C.

The discovery can’ t fully prove that the Mars once hosted life.

D.

The lake traces prove that there exists life on Mars now.

答案:1.A;2.C;3.A;4.D;
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科目:高中英语 来源: 题型:053

阅读理解:阅读下列短文, 从所给的四个选项中, 选出最佳答案。 

    Animals seem to have the sense to eat when they are hungry and   they do not eat more than their bodies need. It has been demonstrated   (证实) that rats will, when given a choice over a period of time,   prefer water with vitamins (维生素) to water without vitamins, even   though there is no difference in taste or smell between the two water   bottles. When a fragrant flavor (香味) was added to the   vitamin—enriched liquid, the rats did seem to develop a taste for it   and kept drinking it, even after the vitamins were switched (转) to   the clear water. In time, however, they broke the habit and went back   to where the necessary vitamins were.

  

      In an experiment, babies of 6 to 12 months old were placed in a   cafeteria (自助食堂) with a wide selection of baby food before them.   They were given whatever food they pointed to or appeared interested   in. We are told that at first they showed some unusual eating   patterns, but over a period of time they managed to select a well   balanced diet (饮食).

  

       So, in selecting food, rats and babies do seem to know and act on   what's best for them. Clearly, there is a kind of "body wisdom" which   humans soon lose. Most of us do not eat as wisely as we could. Many   of our food preferences are culturally determined and influenced (影   响) by long-established habits. Some people eat fox, dog and   blackbirds, while we eat cows and pigs. So what people eat and how   much they eat seems to be greatly influenced by what is going on   around them.  

  

(1)In the experiment on rats, a fragrant flavor was added to the   rat's drinking water to ________.

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A. encourage rats to drink it     

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[  ]

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[  ]

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科目:高中英语 来源:学习高手必修四英语人教版 人教版 题型:050

阅读理解

A Giant Leap for China

  A few days ago, he was just Colonel(上校)Yang; few people knew his name or recognized his face.But last Thursday, when he came back to the earth after a 21-hour trip to space, Yang Liwei’s smile was seen across the world above the magic words:“China’s first spaceman”.

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What is the main idea of the story?

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A.

China’s first manned flight.

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A hero with great courage.

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The first Chinese man in space.

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How Yang Liwei became China’s first spaceman.

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1 hour.

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1.5 hours.

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6 hours.

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Why did the writer mention the gravitation forces on take-off and landing?

[  ]

A.

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Because it was a very special experience.

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To show that Yang is brave.

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Why did the writer use “giant leap” in the title?

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A.

Because the space flight marked China’s great progress in the field of space exploration.

B.

Because Neil Armstrong said it was a “giant leap” for mankind when he first set foot on the moon.

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Because the space flight was a huge success.

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Both A and B.

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A.

newspaper

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textbook

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science magazines

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biographies(传记)

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科目:高中英语 来源:福建省晋江市养正中学2008-2009学年高一下学期第一次月考英语试题 题型:050

阅读理解

  Many people like the feeling of the gentle wind in spring.Many like to see the falling leaves dancing in the wind in autumn.But sometimes, when the wind becomes a storm, it can be very destructive(毁灭性的).

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form off the coast of Africa and America

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[  ]

A.

begins to move

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A.

a, d, e, b, c, f

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a, b, c, f, d, e

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d, a, b, c, e, f

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d, a, c, e, f, b

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[  ]

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B.

Every year at least 60 storms form off Africa.

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in the interests of

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six times

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科目:高中英语 来源:江西省吉水中学2012届高三周考英语试卷(十) 题型:050

阅读理解

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[  ]

A.

the British at home and abroad

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English learners across the globe

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[  ]

A.

a, b

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c, d

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[  ]

A.

contact the subscriptions department

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