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【单选题】
()，群体凝聚力越强。
A.
群体成员在一起时间越多
B.
加入群体越容易
C.
群体规模越大
D.
男性成员越多
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【单选题】Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health community needs now is a human vaccine for the bird flu pandemic sweepin...
A.
it has strong side effect to the elderly.
B.
it may turn ineffective in a short period.
C.
it is useless in pring the virus.
D.
it hasn’t been tested in humans.
相关题目：
【单选题】Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health community needs now is a human vaccine for the bird flu pandemic sweepin...
A.
it has strong side effect to the elderly.
B.
it may turn ineffective in a short period.
C.
it is useless in pring the virus.
D.
it hasn’t been tested in humans.
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