题目内容

Accidents are of frequent（）on this motorway because the traffic is extremely heavy here.

A. arrival
B. proportion
C. scale
D. occurrence

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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

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