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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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
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
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