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

　　答案：A　 细节理解题。由原文最后一句可直接找到答案。

　　. 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：D

　　　推理判断题。由第一段内容可知火星上湖岸线的发现只是增加了人们发现亿万年前火星上曾经存在生命证据的可能性，但并不能推出火星上现在有生命。

　　(2017江苏,C)If a diver surfaces too quickly,he may suffer the bends.Nitrogen(氮) dissolved(溶解) in his blood is suddenly liberated by the reduction of pressure.The consequence,if the bubbles(气泡)accumulate in a joint,is sharp pain and a bent body—thus the name.If the bubbles form in his lungs or his brain,the consequence can be death.

　　Other air-breathing animals also suffer this decompression(减压) sickness if they surface too fast: whales,for example.And so,long ago,did ichthyosaurs.That these ancient sea animals got the bends can be seen from their bones.If bubbles of nitrogen form inside the bone they can cut off its blood supply.This kills the cells in the bone,and consequently weakens it,sometimes to the point of collapse.Fossil(化石)bones that have caved in on themselves are thus a sign that the animal once had the bends.

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