填空题

______ is very important to the absorption of the rainfall.

【参考答案】

Vegetation
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填空题
A variety of gases trapped in the Earth’s atmosphere can ensure life on Earth because they are ______.
单项选择题
A．Curious.B．Lazy.C．Cautious.D．Cowardly.
A．Curious.
B．Lazy.
C．Cautious.
D．Cowardly.
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