单项选择题

The main reason why people fail to act when they stay together is that_____.

A．they are afraid of emergencies
B．they are reluctant to get themselves involved
C．others will act if they themselves hesitate
D．they do not have any direct responsibility for those who need help
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单项选择题
Which of the following is NOT true
A．When a person tries to help others, he must be clear that there is a real emergency.
B．When a person tries to help others, he should know whether hey are worth his help.
C．A person must take the full responsibility for the safety of those in emergencies if he wants to help.
D．A person with a heart attack needs the most.
单项选择题
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
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