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题目材料：
When aspirin relieves pain, it does so partly by blocking the body's output of prostaglandins. chemicals that can produce inflammation and pain in the joints. Unfortunately, prostaglandins also produce a coating that protects the stomach from stomach acid, so taking aspirin can cause stomach upset. A recently developed medication promises to relieve pain without blocking prostaglandin production. Therefore, if this promise is fulfilled, the new medication will relieve pain without causing stomach upset.
The argument is most vulnerable to criticism on which of the following grounds?
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A. It relies on using a crucial term in two different senses.
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B. It relies on vague suppositions about future developments in order to gloss over a current difficulty.
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C.The fact that a certain effect can be produced in one way is taken to mean that the effect cannot be produced in any other way.
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D.The fact that a substance is known to produce a certain effect some of the time is taken to mean that the substance produces the effect all of the time.
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E.A substance that is said to have both positive and negative effects is treated as if it had only a negative effect.
C显示答案
