专四

单选题Overpopulation poses a terrible threat to the human race. Yet it is probably __________ a threat to the human race than environmental destruction.

A．no more 
B．not more 
C．even more 
D．much more

参考答案：B进入在线模考
【译文】人口过剩对人类造成了严重的威胁。但是它对人类构成的威胁很可能并不比环境破坏造成的威胁大。
【解析】考查比较级的否定形式not more…than和no more than的用法与区别。yet常用于否定句和疑问句，也就是说下旬是对上句的“否定”，因此可以排除C和D。no more…than否定的是前后两个比较对象，意思是“两者都不”，如：You are no more honest than he is．(你和他一样不诚实。) 如果选A，意思就成了：人口过多跟环境破坏一样对人类不构成什么威胁。这不符逻辑，因为前一句说了，人口过剩构成了威胁。因此8为正确选项。

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