选哪个哩？

hey_cathy

People who are slightly overweight tend tobe healthier than people who are slightly underweight, since a survey show that,on average, people who are moderate overweight are healthier than people who are moderate underweight.
The logic flaw of the reasoning is that___.
 The only premise of the conclusion presupposes the truth of the conclusion.
 The author fails to account that people with poor health tend to be underweight.

hey_cathy

观光的多发言的少啊~我选1，狗狗主人貌似选的2，请高人指点！

hey_cathy

我来自己顶一个吧，请大家踊跃发言呀~