单项选择题

A．Pollution of the environment.
B．A new generation of pest killers.
C．Over-killing by hunters.
D．Destruction of their natural homes.
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单项选择题
A．There were fatal mistakes in its design.B．The builder didn’t observe the building codes of the time.C．The traffic load went beyond its capacity.D．It was built according to less strict earthquake-resistance standards.
A．There were fatal mistakes in its design.
B．The builder didn’t observe the building codes of the time.
C．The traffic load went beyond its capacity.
D．It was built according to less strict earthquake-resistance standards.
单项选择题
A．The train seldom arrives on time.B．The schedule has been misprinted.C．The speakers arrived at the station late.D．The company has trouble printing a schedule.
A．The train seldom arrives on time.
B．The schedule has been misprinted.
C．The speakers arrived at the station late.
D．The company has trouble printing a schedule.
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