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。
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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