单项选择题

A．To observe people’’s attitude towards strangers.
B．To see how people get along with their friends.
C．To change people’’s behaviour in social life.
D．To find out how shy people are.
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单项选择题
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
单项选择题
The word meltdown in Paragraph 1, sentence 1 is closest in analogy to _______.
A．the radioactive core of a nuclear Dower
B．a controlled nuclear reaction
C．nuclear energy slips out of control and ends up in a full-blown disaster
D．the breakdown of the cooling system
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