BBC 6 minutes-Day 5-Mars

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 ext reme 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 c ollision 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