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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

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。根據句意說明使用動名詞的被動形式。故D正確。
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常性習慣性的行為。
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