大全-D-14

14. A nutritionist studying the effects of massive doses of vitamin C found that of a group of 600 people who regularly took 1,500 mg of vitamin C daily for a year, fewer than 9 percent suffered serious cases of flu; of a group of 600 people who took 250 mg of vitamin C (the standard recommended daily allowance) daily for a year, 34 percent suffered at least one serious case of flu; and of a group of 600 people who took no vitamin C for a year (other than that found in the foods in a balanced diet), 32 percent suffered at least one serious case of flu.
Which of the following hypotheses is best supported by the evidence above?
(A) The effectiveness of vitamin C in preventing serious cases of flu increases in direct proportion to the amount of vitamin C taken.
(B) Vitamin C is helpful in preventing disease.
(C) Doses of vitamin C that exceed the standard recommended daily allowance by 500 percent will reduce the incidence of serious cases of flu by 25 percent.
(D) Massive doses of vitamin C can help to prevent serious case of flu.
(E) A balanced diet contains less than 250 mg of vitamin C.
答案D, 觉得有疑问. 因为原文在描述这个调查结果的时候是将"massive doses"三个结果之前,也就是说可以从整体上把三种结果都称为massie doses的结果,(因为后面的句式是: of..., of... and of...) 可是, 原文并不能像D中所说的可以prevent, 有一些就没有prevent, 这个结论是不是不太全面. 我选C, 可是C怎么错了呢? 明白的人帮忙看看.