单项选择题

The purpose of this passage is_____.

A．to explain why people fail to act in emergencies
B．to explain when people will act in emergencies
C．to explain what people will do in emergencies
D．to explain how people feel in emergencies

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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

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.