As we all know, telephone wires are______ by a covering of rubber of paper.A、wed

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问题 As we all know, telephone wires are______ by a covering of rubber of paper.

选项 A、wedged
B、strapped
C、insulated
D、stiffened

答案 C

解析题意是：电话线通过一层橡皮纸而被______。 [C]insulated“使绝缘”，符合题意。 [A]wedged“楔入，楔进”， [B]strapped“拿带子捆扎”， [D] stiffened“使变硬，使僵硬”都与题意不符。

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