单项选择题

A．It affects the growth of trees.
B．It has been increasing since the Ice Age.
C．It is determined by the chemicals in the air.
D．It follows a certain cycle.
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单项选择题
A．Limiting the amount of fish to be caught.B．Forbidding the killing of wild animals.C．Controlling land area.D．Protecting irrigation water.
A．Limiting the amount of fish to be caught.
B．Forbidding the killing of wild animals.
C．Controlling land area.
D．Protecting irrigation water.
填空题
originate
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