单项选择题

A. In the air.
B. On the airfield.
C. Under water.
D. At the plane manufacturing factory.
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3.2 percent alcohol beer
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A. It influences the surface temperature of Mars. B. It protects living beings from harmful rays. C. It keeps a planet from overheating. D. It is the main component of the air people breathe.
A. It influences the surface temperature of Mars.
B. It protects living beings from harmful rays.
C. It keeps a planet from overheating.
D. It is the main component of the air people breathe.
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