大全342

baby11

1. If industrial pollution continues to deplete the ozone layer, the resulting increase in ultraviolet radiation will endanger human health, causing a rise in the incidence of skin cancer and eye disease, and perhaps even threatening global ecological systems.

(A) and perhaps even threatening

(B) and may even threaten

(C) and even a possible threat to

(D) as well as possibly threatening（B）

(E) as well as a possible threat to

i selected A ,why b??? please

baby11

以下是引用topway5在2004-12-13 10:23:00的发言：

will endanger human health and perhaps even threaten global eco. systems

causing .... 是同位语修饰 human health 的。

如果选 A 的话， endanger ..., causing ..., and threatening ..., 不能平行的。

如果你认为后面两个causing..., and threatening ... 并列的话，那么其间的逗号应该省略的呀。

明白了，太感谢了

topway5

will endanger human health and perhaps even threaten global eco. systems

causing .... 是同位语修饰 human health 的。

如果选 A 的话， endanger ..., causing ..., and threatening ..., 不能平行的。

如果你认为后面两个causing..., and threatening ... 并列的话，那么其间的逗号应该省略的呀。