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A．In warm air.
B．In cold air.
C．When it reaches the polar region.
D．Only when the clouds are down low.
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It’’s important for astronauts to exercise in order to keep their muscles fit.
A．Y
B．N
C．NG
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A．Give Simon a different office.B．Complain to the department head.C．Move the supplies to the storage room.D．Try to get a room to use for meetings.
A．Give Simon a different office.
B．Complain to the department head.
C．Move the supplies to the storage room.
D．Try to get a room to use for meetings.
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