The source (源头) of the water is a mystery. Scientists noted it could be melting ice. It could be an underground aquifer, which is rock or sand that can hold water. It is possibly water vapor from the thin Martian atmosphere. Or it may be a combination.

　　Michael Meyer, lead scientist for NASA's Mars exploration program, said the only definitive way for now to determine whether there's life on Mars is to collect rocks and soil for analysisW5 on Earth—something a US

　　lander set for lift－off in 2020 will do.

　　在火星上发现了水的痕迹，这是否意味着会有生命存在呢？是否适合人类居住呢？

　　5．What would be the best title for the text?

　　A．Streams of Water Spotted on Mars

　　B．Astronauts will Land on Mars

　　C．NASA's

　　Mars Exploration Program

　　D．A Breakthrough in the Exploration of Mars

　　答案：A　主旨大意题。从文中第一段即可归纳出题目。

　　6．According to John Grunsfeld, there seems to be________on Mars.

　　A．salty water

　　B．standing water

　　C．rocket fuel

　　D．human beings

　　答案：A　事实细节题。从文中第一段的第一句可看出。

　　7．Scientists are uncertain about the________of the water on Mars.

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