单项选择题

One cannot ______ getting good pictures on television unless there is a relay station within 160 kilometres

A．encounter
B．account for
C．count on
D．discount
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单项选择题
He ______ the bushes around his house carefully with D.D.T. every evening.
A．scattered
B．spread
C．sprayed
D．distributed
单项选择题
During the Ice Ages, man developed the use of tools, and thus a way of protecting himself against ______.
A．shortcomings
B．faults
C．mistakes
D．hazards
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