单项选择题

A．Oil shortage.
B．Large population.
C．Air pollution.
D．A large-scale war.
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单项选择题
A．Ask if he can drive the car.B．Repair the seats.C．Offer to buy the car.D．Look for a better deal.
A．Ask if he can drive the car.
B．Repair the seats.
C．Offer to buy the car.
D．Look for a better deal.
单项选择题
A．Psychologists do not yet know how people see.B．The best experiments are those in which all factors are controlled.C．The study of perception is going on now.D．Perception does not involve psychological factors.
A．Psychologists do not yet know how people see.
B．The best experiments are those in which all factors are controlled.
C．The study of perception is going on now.
D．Perception does not involve psychological factors.
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