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 analysis 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,意味着是否会有生命呢?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.
A.state
B.source
C.temperature
D.taste
答案:B 事实细节题。从文中倒数第二段“The source of the water is a mystery”可选出B项。
8.What matters to the existence of liquid water on Mars?
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