单项选择题

A. The plane flies at high altitudes.
B. The plane is filled with air.
C. The metal structure of the plane is very strong.
D. A small part of the plane cracks.
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单项选择题
A. To let out clean gas. B. To take in harmful gas. C. To use various plants. D. TO let the air flow freely.
A. To let out clean gas.
B. To take in harmful gas.
C. To use various plants.
D. TO let the air flow freely.
单项选择题
A. The plane can’t fly without air. B. The plane needs air for its refueling. C. It meets the passengers’ needs. D. It meets the pilots’ needs.
A. The plane can’t fly without air.
B. The plane needs air for its refueling.
C. It meets the passengers’ needs.
D. It meets the pilots’ needs.
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