语篇解读：本文记述了美国科学家对火星的探索情况。

　　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

　　解析：细节理解题。根据第二段可知答案为A项。

　　答案：A

　　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

　　解析：细节理解题。根据第六段中it showed the lake existed at a time when Mars was thought to have been cold and dry可知答案为C。

　　答案：C

　　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.

　　解析：细节理解题。由原文最后一句可直接得出答案。

　　答案：A

　　4．Which of the following statements is NOT true according to the passage? A．The Noachan epoch was a wet and warm era.

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