单项选择题

A．Because they are not accustomed to it.
B．Because they are not psychologically prepared for it.
C．Because their genes differ from those who have been tested for it.
D．Because they arc less sensitive to it than those who have been tested for it.
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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
A．His job as a police officer.B．His personal life.C．How stressful patrol work is.D．How police officer are taught to deal with stress.
A．His job as a police officer.
B．His personal life.
C．How stressful patrol work is.
D．How police officer are taught to deal with stress.
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