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．Summer.B．Winter.C．Fall.D．Sprin
A．Summer.
B．Winter.
C．Fall.
D．Sprin
单项选择题
A．In her early twenties.B．Between twenty -five and thirty.C．Over thirty.D．Under twenty.
A．In her early twenties.
B．Between twenty -five and thirty.
C．Over thirty.
D．Under twenty.
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