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　　2. A double-blind study, in which neither the patient nor the primary researcher knows whether the patient is being given the drug being tested or a placebo, is the most effective procedure for testing the efficacy of a drug. But we will not be able to perform such a study on this new drug, since the drug will have various effects on the patients’ bodies, which will make us aware of whether the patients are getting the drug or a placebo.

　　The two portions in boldface play which of the following roles?

　　(A) The first is a general consideration that introduces the argument; the second is a special situation that weighs against the first.

　　(B) The first is a general principle that is necessary for this argument; the second is an anti-consideration that the argument includes.

　　(C) The first is a premise that this argument includes; the second is a main idea that can be drawn from this argument.

　　(D) The first is an evidence that this argument includes; the second is a conclusion that can not be drawn from this argument.

　　(E) The first is a general situation that supports this argument; the second is a conclusion that can be drawn from a special fact.

　　参考答案: B

　　思路：A double-blind study, in which neither the patient nor the primary researcher knows whether the patient is being given the drug being tested or a placebo, is the most effective procedure for testing the efficacy of a drug.(principle) But we will not be able to perform such a study on this new drug, since the drug will have various effects on the patients’ bodies, which will make us aware of whether the patients are getting the drug or a placebo. (anti-coideration)

　　网友的观点：

　　Vrylwj: 我认为C不太对。(C) The first is a premise that this argument includes; the second is a main idea that can be drawn from this argument. premise 应是支持argment. the first 没有支持。main idea 的说法也不太好。我最初是想在A和B中选一个的。最后还是选了B. 我认为A不好。因为the second应该也是结论的一部分，而不是special situation weigh against the first.

　　Cooperqi: 第二句并不是用来反对第一句的，而是提出相反的结论

　　完全同意。选B

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