单项选择题

Fields neighboring the nuclear plant are higher than regular levels of radioactivity.

A．significant
B．usual
C．important
D．harmful
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单项选择题
The new type of car is fairly economical of fuel.
A．using little
B．effective
C．efficient
D．economic
单项选择题
She was one of the leading writers of her day.
A．expected
B．natural
C．most important
D．least
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