单项选择题

Passage Two

A. To let out clean gas.
B. To take in harmful gas.
C. To use various plants.
D. To let the air flow freely.
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单项选择题
The word shed in the 3rd paragraph means closest to （） .

A. fear
B. recover from
C. develop
D. suffer from
单项选择题
A. To find out exactly what happens. B. To save fuel to fly longer.C. To find out where the big stone is. D. To fly even more slowly.
A. To find out exactly what happens.
B. To save fuel to fly longer.
C. To find out where the big stone is.
D. To fly even more slowly.
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