单项选择题

A．They lifecycle of trees.
B．The number of trees.
C．The intensity of solar burning.
D．The quality of air.
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单项选择题
A．They want to sleep well at night.B．Their parents want them to do so.C．They fall far behind the others.D．They know that training is very important.
A．They want to sleep well at night.
B．Their parents want them to do so.
C．They fall far behind the others.
D．They know that training is very important.
单项选择题
A．15,000 meters.B．10,000 meters.C．40,000 meters.D．5,000 meters.
A．15,000 meters.
B．10,000 meters.
C．40,000 meters.
D．5,000 meters.
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