The radiation amount of a mobile phone for two half-hour periods per day is equal to ______ to an X-ray for ten seconds.

A.exposeB.exposingC.exposedD.being exposed

D

解析試題分析:考察動名詞用法。固定搭配be equal to…與…平等;其中的to是介詞,后面要接動名詞形式。教育:每天兩個半小時的手機的輻射量相當于被X光線照射10秒。根據(jù)句意說明使用動名詞的被動形式。故D正確。
考點:考察動名詞用法
點評:本題考察的動名詞的用法,介詞后面要接動名詞形式,要根據(jù)上下文的語境來使用主動或者被動形式。另外要注意動名詞表示的是經(jīng)常性習慣性的行為。

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