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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  56
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] 【M10】
选项
答案 删掉time
解析 表示“三秒钟”的时间长短，只需要3 seconds就足够了，如果一定要加time，则应该是3 seconds， time。
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