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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.

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网友解析

当前版本由 SH-ASH 更新于2015-10-17 16:16:59 感谢由 SH-ASH 对此题目的解答所做出的贡献。
(A) promotes…, but not…interfering…结构不平行

(B) 错误同A选项;
(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
(E) but not a serious语法上只能跟is a substance并列(因为前面有which is a substance that… 所以but not a serious…可以视为but is not a serious…的省略结构,但是却不能做为…usually suffices的省略结构),共同修饰thromboxane,改变了原句的意思
当前版本由 晔晔 更新于2017-09-05 16:14:28 感谢由 晔晔 对此题目的解答所做出的贡献。
  1. 同位语优于定语从句。排除ADE

  2. 平行结构:promote 和 interfere,形式必须相同,排除有名词和动名词的选项ABE

  3. C正确。


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  • 用户头像

    Kath1230

    D which is a substance to promote blood clotting, but does not seriously interfere
    D错误的原因主要是to promote这个不对吧,a substance 不能自己直接to promote
    C a substance that promotes blood clotting, but does not seriously interfere
    所以C同位语比较简洁,并且合乎逻辑
    18楼  | 2019-02-11 19:31:23 回复
  • 用户头像

    考GMAT的大树

    C选项里的promotes blood clotting与未划线部分的prevents clotting 平行
    17楼  | 2018-12-08 14:04:15 回复
  • 用户头像

    Adam贾

    but前后的形式要一致
    16楼  | 2018-11-15 16:46:59 回复
  • 用户头像

    天天已被占用

    网友SH-ASH的解析是错的,a substance that是同位语结构,不是独立主格结构。同位语结构在句子中做定语,修饰名词;独立主格结构在句子中做状语,修饰主句。
    15楼  | 2018-11-12 11:21:09 回复
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    Hugin

    两个which不是一样的句子结构,a substance那个是同位语从句。最后那个是宾语从句。这俩结构不一样实际上不平行
    14楼  | 2018-08-31 16:23:28 回复
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    Hugin

    怎么看出来是promote和interfere平行的啊???为啥我咋看都感觉是suffice和interfere平行啊。。。orz
    13楼  | 2018-08-31 16:20:09 回复
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    rany

    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)
    11楼  | 2018-07-26 11:13:21 回复
  • 用户头像

    rany

    roblem #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)
    10楼  | 2018-07-26 11:13:12 回复
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    rany

    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)
    9楼  | 2018-07-26 11:12:53 回复
  • 用户头像

    rany

    1. "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)

    2. 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)

    12楼  | 2018-07-26 11:11:49 回复
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