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题库 / Prep2007E1-SC-35
In laboratory rats, a low dose of aspirin usually suffices to block production of thromboxane, which is a substance that promotes blood clotting, but not seriously interfering with the production of prostacyclin, which prevents clotting.
which is a substance that promotes blood clotting, but not seriously interfering
a substance that promotes blood clotting, but not seriously interfering
a substance that promotes blood clotting, but does not seriously interfere
which is a substance to promote blood clotting, but does not seriously interfere
which is a substance that promotes blood clotting, but not a serious interference
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there are two problems i see in (d).
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problem #1
a substance to promote... is unidiomatic.
the only context in which i can remember "a NOUN to VERB" is a context in which the NOUN is abstract in nature. for instance:
a way to produce goods
a reason to try harder
etc.
note that "substance" is a concrete item; it's not an abstraction like "way" or "reason".
if you're talking about concrete objects, you should replace the infinitive with something else. for instance:
* a substance to promote X (incorrect) --> a substance that promotes X (correct)
* a tool to install the shelves (incorrect) --> a tool with which to install the shelves (correct)
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problem #2
"which is" is unnecessary and ugly.
if "which is" is followed by a description of something, you should just omit it, producing an appositive modifier:
X, which is a substance... (ugly) --> X, a substance... (better)
Person X, who is the coach of Team Y (ugly) --> Person X, the coach of Team Y (better)
* a substance to promote X (incorrect) --> a substance that promotes X (correct)
* a tool to install the shelves (incorrect) --> a tool with which to install the shelves (correct)
"which is" is unnecessary and ugly.
if "which is" is followed by a description of something, you should just omit it, producing an appositive modifier:
X, which is a substance... (ugly) --> X, a substance... (better)
Person X, who is the coach of Team Y (ugly) --> Person X, the coach of Team Y (better)
其实就是纠结CD
D、a substance to的问题xdjm们说的很清楚了， 后面的but句构成歧义（与谁平行成迷）
----Problem2: "which is"is unnecessary and ugly , 同位语较优！
the only context in which i can remember "a NOUN to VERB" is a context in which the NOUN is abstract in nature. for instance:
a way to produce goods
a reason to try harder
note that "substance" is a concrete item; it's not an abstraction like "way" or "reason".
(C) 正确, a substance that…独立主格结构作为thromboxane的同位语对thromboxane进行解释
说明; but does跳过同位语和suffices并列共同作为a low dose of aspirin的谓语动词
(D) but does…更像是跟is a substance…并列,从而作为了thromboxane的谓语动词,改变了原句
的意思
具体的名词不能用to修饰
thromboxane，是一种物质that可以阻止血凝块，
thromboxane，是一种可以阻止血凝块的物质
第二种更加符合逻辑
一点点阿斯匹林就足够阻止T产生，which is a substance that promotes blood clotting，（T物质的）一个特征是防止血凝块； a substance that promotes blood clotting，（T是）一种防止血凝块的物质
这里是对T进行解释，它是一种防止血凝块的物质，而不是描述它的一个特征是防止血凝块
可以可以，精辟
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定语从句是解释先行词的一个特征，which引导非限制性定语，是一个什么什么样的物质的T，独立主格更优