题目内容
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.expose
B.exposing
C.exposed
D.being exposed
答案:D
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题目内容
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.expose
B.exposing
C.exposed
D.being exposed