单项选择题

A．On the table.
B．Behind his back.
C．Under his bottom.
D．On his lap.
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单项选择题
A．In warm air.B．In cold air.C．When it reaches the polar region.D．Only when the clouds are down low.
A．In warm air.
B．In cold air.
C．When it reaches the polar region.
D．Only when the clouds are down low.
单项选择题
It’’s important for astronauts to exercise in order to keep their muscles fit.
A．Y
B．N
C．NG
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