单项选择题

A．control of natural hazards
B．control of heavy traffic
C．control of heart disease
D．control of man-made hazards
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单项选择题
A．To tie her shoes.B．Through the gate.C．To the lake.D．Under the hedge.
A．To tie her shoes.
B．Through the gate.
C．To the lake.
D．Under the hedge.
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.
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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