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 last two paragraphs tell us about______.

A．future technology of robots
B．automated machines' use
C．the tiny robots
D．the development of micro-electromechanical technique

单项选择题

Which of the following is NOT tree

A．When a person tries to help others, he must be clear that there is a real emergency.
B．When a person flies 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.