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  3. For thousands of years comets had been a mystery to

For thousands of years comets had been a mystery to

游客2023-07-23  45
问题     For thousands of years comets had been a mystery to                              【M1】______
man. They travel across the sky very fast and have a
bright ’tail’ of burnt gas. The comet Tempel I has an                                【M2】______
orbit far outside the orbit of the furthest planet in our
solar system, Pluto. It has had been there for 4.6 billion years,                    【M3】______
133 million kilometres from Earth. Last week
a little American spacecraft crash into Tempel 1.                                    【M4】______
The spacecraft had a camera and it took a photograph
of the comet every minute after it finally crashed into                              【M5】______
its surface. The space mission to Tempel 1 cost $ 335
million and was called Deep Impact. Spacecraft was                                   【M6】______
travelling at 37,000 kilometres per hour when it hit the comet
and the crash completely destroying the spacecraft. But before                       【M7】______
it hit the comet, the spacecraft took some amazingly photographs.                    【M8】______
The last one was a close up picture the spacecraft spent                             【M9】______
just 3 seconds time before it crashed into the comet.                                【M10】______ [br] 【M2】
选项
答案 burnt改成burning
解析 又是考现在分词和过去分词。过去分词表被动或完成。现在分词表主动或正在进行。彗星飞行时尾巴是看得见的，应该是“正在燃烧的”的意思，不能是“已经燃烧完了”的意思。所以应该用表主动和正在进行的现在分词。举个例子，就象boiling water是沸水，正在沸腾的水。boiled water是凉开水，沸腾过了的水。
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