单选题______AhelpfulBsuitableCunstableDawful

单选题
______
A

helpful

B

suitable

C

unstable

D

awful


参考解析

解析:
词义辨析题。helpful“有帮助的,有用的”,suitable“适当的,相配的”,unstable“不稳定的”,awful“可怕的,糟糕的”。上文提到这种身体位置的重要改变带来了诸多不利,结合常识可知,猿人刚直立行走时摇摇晃晃的,且下文也出现了相关表达unstable position,因而可知C最符合文意。

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