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
What is the main idea of the forth paragraph
A．Impact of robots.
B．Relationship between robots and jobs.
C．Robotic manipulators.
D．Damages of robots.
单项选择题
The author wants to tell us in the Para 1-3_____.
A．robots can be used in many fields
B．what jobs robots can do
C．robots' activities
D．human being's partner—robots
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