单项选择题

A．Employ them as lab assistants.
B．Teach chemistry classes at their high school.
C．Help them with their studies.
D．Pay them for participating in the study.
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单项选择题
A．Experience in negotiating.B．A high level of intelligence.C．The time they spend on preparation.D．The amount of pay they receive.
A．Experience in negotiating.
B．A high level of intelligence.
C．The time they spend on preparation.
D．The amount of pay they receive.
单项选择题
A．He’’s not so sure to buy the car.B．He’’s ready to buy that car.C．He’’s certain to buy the car.D．He’’s afraid to buy that car.
A．He’’s not so sure to buy the car.
B．He’’s ready to buy that car.
C．He’’s certain to buy the car.
D．He’’s afraid to buy that car.
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