题目内容

Professor Collins was（）of the latest developments in physics because he had been in hospital for several months.

A. unconscious
B. negative
C. robbed
D. ignorant

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Years of（）labor had hardened his muscles.

A. survival
B. mental
C. restless
D. manual

Fertilizer will（）the growth of these tomato plants.

A. accomplish
B. accelerate
C. accumulate
D. account

幼儿看到榜样攻击行为受到奖励时，就倾向于模仿这类行为；当看到榜样行为受到抑制时，就抑制这种行为的发生，这是（）在发生作用。

A. 直接强化
B. 间接强化
C. 替代强化
D. 自我强化

The old man did not seem to attach any importance（）the question.

A. to
B. with
C. towards
D. for