单项选择题

Ever since the first nuclear power stations were built, doubts have ______ about their safety.

A．suspended
B．survived
C．lingered
D．preserved
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单项选择题
The cycles of the sun and moon are simple but ______ forces which have shaped human lives since the beginning.
A．gigantic
B．maximum
C．sensational
D．frantic
单项选择题
To label their product as organic, farmers have to obtain a certificate showing that no ______ chemicals have been used to kill pests on the farm for two years.
A．tragic
B．toxic
C．notorious
D．nominal
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