单项选择题

According to the passage, the experience of helplessness causes rats to______.

A．try to control unpleasant stimuli
B．turn off the electricity
C．behave passively in controllable situations
D．become abnormally suspicious
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单项选择题
A．According to Professor Wang, what is the purpose of the present-day educationB．To turn out an adequate number of elite for the society.C．To prepare students for their future career.D．[C) To offer practical and utilitarian courses in each program.E．To set up as many technical institutions as possible.
A．According to Professor Wang, what is the purpose of the present-day education
B．To turn out an adequate number of elite for the society.
C．To prepare students for their future career.
D．[C) To offer practical and utilitarian courses in each program.
E．To set up as many technical institutions as possible.
单项选择题
It can be concluded from the passage that the immune systems of ani mal
A．can he weakened by conditioning
B．can be suppressed by drug injections
C．can be affected by frequent doses of saccharin
D．can be altered by electric shocks
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