OG034

F2JJ

34.   A report by the American Academy for the Advancement of Science has concluded that much of the currently uncontrolled dioxins to which North Americans are exposed comes from the incineration of wastes.

(A) much of the currently uncontrolled dioxins to which North Americans are exposed comes

(B) much of the currently uncontrolled dioxins that North Americans are exposed to come

(C) much of the dioxins that are currently uncontrolled and that North Americans are exposed to comes

(D) many of the dioxins that are currently uncontrolled and North Americans are exposed to come（E）

(E) many of the currently uncontrolled dioxins to which North Americans are exposed come

dioxin是可数名词？那二氧化碳呢？

joe11

二氧化碳  不可数

F2JJ

谢谢版主！但怎么区别这些化学物质的可数或不可数呢？dioxin好象也是一种化学物质，为什么就不可数？

F2JJ

怎么没有人回答啊？难道问得太幼稚了？

masonyxm

GMAT中，单复数的判别尽量用s判断，我是这样用的。

F2JJ

看来只能死记了。在我印象中，化学药品什么的应该是单数的，不能想当然了。

masonyxm

学科什么的都用复数，只能死记了，不知哪位高人有好的总结？