单项选择题

The best title for this passage is ()

A. The Origin of Life on Earth
B. Life Forms on Earth
C. The Discovery of Life on Earth
D. The Preservation of the Past Life on Earth

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单项选择题
We may conclude that the elevator does not ()

A. go to the top
B. go fast enough
C. cost a lot of money
D. both B and C
填空题
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