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．Two to four months.B．About three weeks.C．At least half a year.D．Two years or more.
A．Two to four months.
B．About three weeks.
C．At least half a year.
D．Two years or more.
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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