科学家的发现

Astronomers(天文学家) have always wondered if life exists beyond Earth. Scientists have used technology and instruments to study it for many times. If it does, our neighbor Mars is the most likely place to find it.

Mars is a planet of wild extremes. It has the largest dust storms, the deepest and longest valley(峡谷), the highest mountain, and the largest volcano(火山) known in our solar system! But to most scientists, the biggest question is whether life is, or was, possible on the planet.

Advances in technology have allowed scientists to match robots with a variety of tools. Then they send them to study Mars. These scientific instruments have been able to discover information that life is possible there. For example, one of the most important requirements for life, the existence of some form of water, has been discovered in several areas of Mars. A large amount of ice is under the surface and also frozen in the polar caps(极地冰冠) year-round. In 2015, scientists found that liquid water exists on Mars's surface. But will this finding lead to the discovery of life on the Red Planet? We're still waiting to find out and we have confidence to get the answer in the near future.

1题完成句子；2题用英语表达文中画线单词It所指代的内容； 3题简略回答问题；4题用英语简要概括本文的主旨大意；5题将文中画线句子译成汉语。

【1】Mars is the____________ place to find the existence of life beyond Earth.

【2】______________________________

【3】What's one of the most important requirements for life according to the passage?

______________________________

【4】The passage is mainly about______________________________.

【5】______________________________