Write ONE WORD AND/OR A NUMBER for each answer.
1 By mentioning in our backyard, Neil meant that Mars is not .... to the naked eye.
2 According to Sophie, Mars is fairly cold, and also ......
3 Scientists agree that ...... water is essential to life.
4 As suggested by John Zrnecki, there is a possibility that life in ..... form can be found on Mars.
5 As different from the Mars, the Earth has a magnetic field which can act as a cushion against solar .....
6 It's estimated that around 4 billion years ago, Mars was damaged by a collision with an ......
7 A ...... which may have contained Martain life forms crashed into the Earth millions of years ago.
相关词伙
恶劣环境下 in harsh/extreme environments
撞击小行星 collision with an asteroid
撞击地球 crash into the Earth
发现生命的痕迹 find traces of life
含有生命体 contain life forms
答案和出处：
1
visible
It is in astronomical terms, Neil – it's visible to the naked eye – meaning without using instruments
2
arid or dry
It's also very arid – or dry.
3
liquid
Many scientists think that liquid water is essential for life
4
primitive
we're finding that life in very primitive form exists in the most extreme environments
5
winds
The Earth has a strong magnetic field created by its hot molten core – or centre – and this protects us from the Sun's harmful solar winds.
6
asteroid
It used to – 4 billion years ago. It’s possible that a massive collision with an asteroid might have heated up Mars's core, disrupting the magnetic fields.
7
meteorite
A meteorite – or a piece of rock from outer space – might've crashed into the Earth millions of years ago. That meteorite might have contained Martian life forms. So we might be descended from Martians!
链接：
http://www.bbc.co.uk/learningenglish/spanish/features/6-minute-english/ep-160303
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