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 milesB．1,500 square miles

　　C．3.4 billion square milesD．300 million square miles

　　答案：A　细节理解题。根据第二段中“The lake，which dates back some 3.4 billion years，appears to have covered as much as 80 square miles”一句，可推知答案。

　　. 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

　　答案：C　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知，答案为C。. 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.

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