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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

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。

不能理解上面斑竹的话,

1.causing 是伴随状语才是,怎么会成为同位语呢

2.两个causing..., and threatening ... 并列是正确的语法现象,其间逗号可省可不省.

请NN给个说法吧

分段  1 endanger human health, 2 causing a rise in the incidence of skin cancer and eye disease,   3and perhaps even threatening global ecological systems

此处 1和3 平行。 2是1造成的结果 是伴随状态  说的是危及人类的健康，表现在提高了皮肤癌和眼疾的患病率。

3是说全球生态环境，从逻辑意思上与1平行

这题比较阴险！

The key is that you should understand that "threatening ..." could not be the result of "endanger human health"

It is more logical that these 2 are the result of "increase in ultraviolate ..."