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【单选题】
麻疹的传染源为A.
隐性感染者
B.
病原携带者
C.
麻疹病人
D.
潜伏性感染者
E.
受感染的动物
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【单选题】American students spend ________ time _______ homework than Chinese students. [ ]
A.
fewer, doing
B.
less, to do
C.
less, doing
D.
least, doing
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