Lesson Five is the most interesting lesson of the ten lessons．This sentence doesn't mean：A.The other nine lessons are not so interesting as Lesson Five．B.Lesson Five is more interesting than the rest of the ten lessons．C.The other nine lessons are less interesting than Lesson Five．D.Lesson Five is interesting．but the other nine lessons are dull．
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D解析分析：原句是最高级。A句用not so…as，B句用more…than，C句用less…than，而且A方和B方分别通过other，the rest进行了分离，因此符合原句的意思。D句的意思是只有Lesson Five是有趣的，否定了其他九课，因此不符合原句的意思。