单项选择题

It is advisable to（）an electric wire with rubber in order to secure safety.

A. desolate
B. resolute
C. insolate
D. insulate

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单项选择题
It was（）to continue the negotiation since both sides lack the sincerity.

A. fertile
B. futile
C. fugitive
D. fussy
单项选择题
Since the two countries couldn’t （） their differences, they decided to stop their negotiations.

A. rectify
B. oblige
C. reconcile
D. obscure
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