Bob has a billion dollars while Kate has a million so Kate is than Bob.A. less richB. not

问题补充：

Bob has a billion dollars while Kate has a million, so Kate is than Bob.

A. less rich

B. not richer

C. no rich

D. poorer

答案：

A. less rich

(答案→)B. not richer

C. no rich

D. poorer

解析：考查形容词用法：less rich than 用法是正确的。从句子意义上来看，Bob有十亿，Kate只有一百万，Bob当然没有Kate富，所以选A. B语法上虽没错，但选B意思是“Bob不比Kate富”，那Bob也有可能与Kate一样富或差不多”，实际上，Bob岂止是不比Kate富，他简直是比Kate差老远了。因此，选B就是词不达意。