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【单选题】
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
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参考答案：
参考解析：
刷刷题刷刷变学霸
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A.
unless
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even though
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if
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when
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as fluent as
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more fluent than
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much fluently than
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A.
No, but she was.
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Yes, she wasn’t
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A.
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A.
that
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A.
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A.
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D.
that was covered