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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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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