Question

NASA’s Mars detector (探測(cè)器), Opportunity, succeeded in finding signs that water once existed on the planet. Opportunity landed on Mars in January. Scientists now believe that the planet could once have supported life.

This discovery was chosen by Science, one of the world’s leading magazines, as the most important scientific achievement of 2004 last Friday.

“This little, wheeled, one-armed box went around another planet and has done something no human has ever managed,” according to Science. “It has discovered another place in the universe where life could once have existed.”

“Although we still can’t say that life could have existed in this environment, it is now certain that there was water on Mars,” said Steve Squyres, one of the scientists working on the Mars mission. The evidence comes from pictures and chemical readings taken by Opportunity. It includes marks on rocks like those caused by flowing water on Earth and salty chemicals like those found in dried-out sea-beds. Scientists said the new evidence proved beyond doubt that water has existed on Mars. But it is still unknown whether the water on Mars was like an ocean or justice.

While Opportunity has not found any signs of life, the presence of water means life is possible. “In everything we know about life on Earth, there is no example without liquid water,” Squyres said. “So water is important for the search for life on Mars.”

Researchers agree that a future mission (任務(wù)) should bring back physical samples (樣品). But some scientists worry about the risk that this could introduce dangerous foreign creatures to Earth. “The problem here is how to get the samples back,” Squyres replied. “I think it is our responsibility to limit any risk.”

1.________ prove that water existed on Mars.

A．The physical samples with salty chemicals

B．The marks on rocks and salty chemicals

C．Scientific achievements of 2004

D．Creatures from Mars

2.Which of the following is TURE according to the text?

A．It is now certain that there was water on Mars.

B．The water on Mars was like an ocean.

C．Evidence of life on Mars has been found.

D．Search for life on Mars is a great risk to humans.

3.How did scientists draw the conclusion that there was water on Mars?

A．The world’s leading magazine has announced the fact.

B．Scientists have taken many pictures and chemical readings on the Mars.

C．Astronauts have got some rocks from Mars.

D．Scientists have made a study of the pictures and readings sent back by Mars detector.

4.It can be inferred that, if the creatures from Mars came to Earth, ________.

A．they would be kind to humans

B．they would be cruel to humans

C．they would be a great danger to Earth

D．it would be hard to say whether it would be a good news or bad news

 

Answer 1

【答案】

1.B

2.A

3.D

4.D

【解析】文章講述的是火星探測(cè)器在火星上發(fā)現(xiàn)了水存在的跡象。

1.事實(shí)細(xì)節(jié)題，根據(jù)第四段的The evidence comes from pictures and chemical readings taken by Opportunity. It includes marks on rocks like those caused by flowing water on Earth and salty chemicals like those found in dried-out sea-beds可知

2.事實(shí)細(xì)節(jié)題，根據(jù)第四段的it is now certain that there was water on Mars可知，他們已經(jīng)確定水的確存在過(guò)，

3.推理判斷題，根據(jù)第四段的The evidence comes from pictures and chemical readings taken by Opportunity可知，這就是科學(xué)家得出結(jié)論的證據(jù)

4.推理判斷題，根據(jù)最后一段的But some scientists worry about the risk that this could introduce dangerous foreign creatures to Earth.可知，如果外形生物來(lái)到地球，到底有沒有風(fēng)險(xiǎn)還不得而知