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7 to 19 are based on this passage
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Question 7
The hypothesis tested by Lind was that
A. lemons contain some substance not present in vinegar
B. the citric acid in lemons is effective in treating scurvy
C. lemons contain some unknown acid that cures scurvy
D. the substance to cure scurvy is found only in lemons
E. some specific substance, rather than acids in general, is needed to cure scurvy
我的答案： 无