呵呵还是兔兔细心呀 哦,那提忘画一条线了 2.Xanthines have both good and bad effects on the body, and these effects are generallydetermined on the size and regularity of dosage.答案是C,我觉得是D应该加the 吧?
the A and B of C <-->the A and the B of C 前者是说C的A和B方面,描述的是一个东西;后者是说C的A方面和B方面,是两个东西。此题两者区别不太明显。GMAT的语法里区分这样的结构比较严格,因为在意思上描述的是两种有差异的东西。但在语法上并不错。 如果后面还有谓语,就要考虑不同的谓语形式。
正好看到一个可以引用的例子: Caves are formed by the chemical and mechanical action of water on soluble rock, by volcanic activity, and by (earthquakes). 可以在mechanical前加上the,就是说的水的两种运动了。