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
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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
感知觉动作发展的关键期是()。
A. 胎儿期
B. 乳儿期
C. 婴儿期
D. 幼儿期
It is a type of desert bush that can()extremes of temperature.
A. adapt
B. withdraw
C. withstand
D. shade