1-(第一次练习,都没有计时,下篇开始计时) some background information premise: The AL disease is caused by protain deposit, and the similar deposit exsits in the old people who suffer from no Al disease. conclusion: old people will eventually get Al disease.
2- premise:today's employers are less impressed with the honor degrees than 20 years ago. conclusion:college should control the grade inflation to restore students' confidence.
3- premise: the US advocates people who use old car but emit more pollution to buy new cars with less pollution. conclusion: the global atmosphere will gradually reduce over the next decade.
4- premise: only when one of the twin is a S, the affected brain is smaller than the unaffeted one, but regular twins have no such situation conclusion:S is the cause of damaging the physical structure of brain.
5- premise:sometimes photo shows truth, but because the lights, photo shows things different than it does conclusion: nothing can be proved to be true through the photo.