题目内容

You should save your work often as a（）against computer failure.

A. sanction
B. precaution
C. shield
D. shelter

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由于看见成人给小孩洗澡，一些儿童也给自己买来的玩具娃娃洗澡，这是思维活动的（）。

A. 直观动作性
B. 抽象概括性
C. 具体形象性
D. 间接概括性

Stone does not（）, and so the tools of long ago have remained when even the bones of the men who made them have disappeared without trace.

A. crack
B. decay
C. destroy
D. crush

His parents no longer worry about him. He has a good job and can live（）his own now.

A. at
B. by
C. on
D. with

自我同一性的理论是由（）提出的。

A. 普莱尔
B. 达尔文
C. 艾里克森
D. 施太伦