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.

　　16．The size of the lake found on Mars is ________．

　　A．80 square miles

　　B．1，500 square milesthe weather on Mars was ________．

　　A．hot and wet

　　B．wet and warm

　　C．cold and dry

　　D．cold and wet

　　18．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.

　　19．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.

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