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yulin115

1.        A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients, is cultivated in China as part of a program to integrate traditional herbal medicine into a contemporary system of health care.

(A) A substance derived from the Madagascar periwinkle, which has proved useful in decreasing mortality among young leukemia patients,

(B) A derivative, which has proved useful in decreasing mortality among young leukemia patients, of the Madagascar periwinkle,

(C) A Madagascar periwinkle derivative, which has proved useful in decreasing mortality among young leukemia patients,

(D) The Madagascar periwinkle has a derivative which has proved useful in decreasing mortality among young leukemia patients, that（E）

(E) The Madagascar periwinkle, a derivative of which has proved useful in decreasing mortality among young leukemia patients,

The correct answer is E, but my choice is D. Can anyone help me? 谢了。

anyname

D 显然错了，逗号后的that怎么也不对吧

选E的原因是："is cultivated" 的主语只能是 "The Madagascar periwinkle"。"A substance/derivative"是不能被cultivated(种植，养殖）的。所以cultivated的是periwinkle，而 proved useful 的则是 a substance derived from periwinkle。因此，E对。

供参考

[此贴子已经被作者于2005-1-30 10:56:19编辑过]

yulin115

got it. Thanks!

judysuomi

弱问一下

我知道E优于C，应该选E

C有错误么？

charismale

以下是引用judysuomi在2007-1-18 14:12:00的发言：

弱问一下

我知道E优于C，应该选E

C有错误么？

derivative 不能被cultivate

LuckiPanda

这破题, 考单词啊
我不认识那俩单词，就类比成：
a derivative of stock is traded in market
a stock derivative is traded in market - 更简洁
搞了半天这个derivative不能trade

果蝇的白眼

我觉得E有歧义啊，是不是可以理解成Madagascar periwinkle是一种derivative？

lcy19812000

不会。

a derivative of which 要一起看做是定语从句引导词。这是常见用法。