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【简答题】
A. Derek's a fool. He ____________ (drink) a lot at a party yesterday and then _____ (drive) home. Of course the police ______ (get) him and _______ (give) him a breathalyzer test. B. It's the second time he _________ (breathalyse); they'll probably ban him from driving for two years.
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【单选题】根据联合国原子辐射效应科学委员会UNSCEAR 2000报告书，天然本底辐射所致全世界人均年有效剂量为()。
A.
0.002 mSv
B.
0.005 mSv
C.
0.4 mSv
D.
2.4 mSv