以下是引用lexie在2006-7-11 14:34:00的发言: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.(D) (E) A balanced diet contains less than 250 mg of vitamin C. Hi guys, I need your help. Why not choose C ? As far as I am concerned, C is more precise than D, because C gave more detailed numbers than D did. As to D, it just gave a very abstract concept " Massive"...but I was wondering...how massive is massive? Any comments or thoughts on this problem? 我想C是不对的。C过于绝对了。读起来的意思好像指 Vitamin C的量必须到达500倍,才能达到防止重感冒的作用。事实上,或许200, 300,400倍的量就能防止重感冒了呢 ? 但是我们可以肯定的从题目给出的事实说:“大量“的 Vitamin C能防止重感冒。这个hypothesis放回题目中也可以被验证的,因为1500mg/daily大大超出正常推荐量的。所以D的假设是最合适的。 |