题目内容

A new study proves a___ walk every day is enough to keep people away from becoming fat.

A. 30–minute
B. 30 minute
C. 30 minute's
D. 30–minutes

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___ trees have been planted near here, so the air is very fresh.

A. Two hundreds
B. Hundred of
C. Hundreds of
D. Hundreds

-When is Mr. Zhang going to China?-On ___.

A. July
B. July fifth
C. the year 2011
D. July, 2011

马克思、恩格斯称

有些幼儿看多了电视上的打打杀杀镜头，很容易增加其今后的攻击性行为。在此，影响幼儿攻击性行为的因素主要是（）。

A. 挫折
B. 榜样
C. 强化
D. 惩罚