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Mars(火星) appears to be flowing with smal...

    Mars(火星) appears to be flowing with small streams of salty water, at least in the summer, scientists reported Monday. “It suggests that it would be possible for there to be life today on Mars,” NASA’s science mission chief, John Grunsfeld, said at a news conference on September 28, 2015.

The streams are about 12 to 15 feet wide and 300 feet or more long, scientists said. “What we’re dealing with is wet soil, thin layers of wet soil, not standing water,” said Aifred McEwen of the University of Arizona at Tueson, the principal scientist for the Mars Reconnaissance Orbiter’s high-resolution imaging experiment.

Because liquid water is essential to life, the findings could have major implications for the possibility of Martian life. The researchers said further exploration is needed to determine whether microscopic life exists on the planet.

The presence of liquid water could also make life easier for astronauts visiting or living on Mars. Water could be used for drinking and for creating oxygen and rocket fuel. NASA’s goal is to send humans there in the 2030s.

The evidence of flowing water consists largely of dark, narrow streaks(条痕) on the surface that tend to appear and grow during the warmest Martian months and fade the rest of the year.

Mars is extremely cold even in summer, and the streaks are in places where the temperature is as low as minus 10 degrees Fahrenheit. But salt can lower the freezing point of water and melt ice.

The source 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 analysis on Earth—something a U. S. lander set for lift-off in 2020 will do.

1.According to John Grunsfeld, there seems to be              on Mars.

A.salty water B.standing water

C.rocket fuel D.human beings

2.Scientists are uncertain about the               of the water on Mars

A.state B.source

C.temperature D.taste

3.What matters to the existence of liquid water on Mars?

A.The distance from the sun B.The favorable climate

C.The gravity of the earth D.The salt in it

4.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

 

1.A 2.B 3.D 4.A 【解析】 这是一篇说明文。文中说明火星上有水的迹象,进而推断火星上可能有生命,但是水的来源仍旧是一个迷。 1.细节理解题。题目问根据John Grunsfeld所说,在火星上好像有什么。根据第一段第一句“Mars(火星) appears to be flowing with small streams of salty water,”火星上好像有含盐的小溪在流动。可知,火星上好像有盐水。故选A。 2.细节理解题。题目问关于火星上的水科学家还不确定什么。根据第七段第一句“The source of the water is a mystery. ”水的来源是个迷,可知,科学家还不确定水的来源。故选B。 3.推理判断题。题目问什么决定了火星上液体水的存在。根据第六段“Mars is extremely cold even in summer, and the streaks are in places where the temperature is as low as minus 10 degrees Fahrenheit. But salt can lower the freezing point of water and melt ice.”即使在夏天火星也极其寒冷,在温度达到零下10华氏度的地方水纹还存在。但是盐可以降低水的结冰点并融化冰。可知,水里的盐决定了火星上液体水的存在。故选D。 4.主旨大意题。题目问哪个可以做文章最佳标题。根据文章第一段“Mars(火星) appears to be flowing with small streams of salty water,”火星上好像有含盐的小溪在流动。可知,“在火星看到了溪水”适合做本文最佳标题。故选A。
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