一道邏輯題

giderchang

Half of the subjects in an experiment-the experimental group-consumed large quantities of a popular artificial sweetener.Afterward, this group showed lower cognitive abilities than did the other half of the subjects-the control group.who did not consume the sweetener.The detrimental effects were attributed to an amino acid that is one of the sweetener's principal constituents.

Which of the following, if true, would best help explain how the sweetener might produce the observed effect?

• A. The government's analysis of the artificial sweetener determined that it was sold in relatively pure form.
• B. A high level of the amino acid In the blood inhibits the synthesis of a substance required for normal brain functioning.
• C. Because the sweetener is used primarily as a food additive, adverse reactions to it are rarely noticed by consumers.
• D. The amino acid that is a constituent of the sweetener is also sold separately as a dietary supplement.
• E. Subjects in the experiment did not know whether they were consuming the sweetener or a second, harmless substance.
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• 重點在最後一句：The detrimental effects were attributed to 「an amino acid」an amino acid that is one of the sweetener's principal constituents. 是amino acid造成兩的實驗組的cognitive abilities不同，答案要有amino acid和cognitive abilities這兩的東西
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• A.在講relatively pure form...無關
• B.amino acid inhibit(抑制) normal brain functioning (brain functioning指的就是cognitive abilities)...正確答案
• C.講food addtive和adverse reaction...無關
• D. sold as a dietary supplement...無關
• E. subject(實驗對象)不知道吃的sweetner是不是harmless substances...無關
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• 要看懂B選項的inhabit(v)抑制，然後主題是amino acid和 cognitive abilities，正確答案會用同義字改寫
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yaya杨

为什么通篇繁体==

liaonotliao

w为什么发这道题？