单选题
The researchers have conducted an experiment to prove that people will act in emergencies when ______.
A、
they are in pairs
B、
they are in groups
C、
they are alone
D、
they are with their friends
【正确答案】
C
【答案解析】
[试题分析] 细节题。
[详细解答] 本题答案可以通过第三段最后两句内容了解。正确答案为C。
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