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.
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单项选择题
Using uniforms as a marketing tool requires great care.
A．Y
B．N
C．NG
单项选择题
A．Walking the dog.B．Cutting the grass.C．Watching the children.D．Feeding the fish.
A．Walking the dog.
B．Cutting the grass.
C．Watching the children.
D．Feeding the fish.
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