Fertilizer will()the growth of these tomato plants.
A. accomplish
B. accelerate
C. accumulate
D. account
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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
The survival of civilization, as we know, is()threat.
A. within
B. under
C. towards
D. upon
Very few plants will()without water.
A. flourish
B. fade
C. stem
D. cultivate