标题: 逻辑题，求大牛 [打印本页] 作者: 小黛安 时间: 2011-8-17 11:12 标题: 逻辑题，求大牛 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. 非常理解D是对的，但是想问问C的漏洞在哪里？作者: sdcar2010 时间: 2011-8-17 11:40
Inference question is must-be-true.
Where can you find that 25% reduction of flu in the passage?作者: 小黛安 时间: 2011-8-17 12:09
I thought 9-34 SO we can't infer those information by ourselves? what's the tip here?作者: msufcu 时间: 2011-8-17 18:03
less than 9 => MORE than 25 不知道对不对作者: 小黛安 时间: 2011-8-17 23:24
我就是这么理解的。。。作者: sdcar2010 时间: 2011-8-18 00:34
The word WILL in choice C kills it.作者: 小黛安 时间: 2011-8-18 02:24
大牛，我还是不是很理解。。。不能用will...作者: sdcar2010 时间: 2011-8-18 02:34
WILL is absolute, definite, a very strong word. A hypothesis with strong words needs strong evidence to back it up. The evidence we have is not strong, only one study. Based on the study, are you sure eating 500% VC WILL (definitely) reduce serious cases of flue by 25%?
D), on the other hand, uses weak language --can-- and is, thus, the correct choice for inference.作者: 小黛安 时间: 2011-8-18 04:24
Thank you sooooooooooooooooooooooooooooooooooooooooooooooo much!