GWD21Q30

ssxxtt27

30. GWD21-Q30:

In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars.Ten years ago, smooth plastic sleds became popular; they go faster than wooden sleds but are harder to steer and slow.The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was ten years ago.

Which of the following, if true in Verland, most seriously undermines the force of the evidence cited?

A.A few children still use traditional wooden sleds.

B.Very few children wear any kind of protective gear, such as helmets, while sledding.

C.Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.

D.Most sledding injuries occur when a sled collides with a tree, a rock, or, another sled.

E.Because the traditional wooden sled can carry more than one rider, an accident involving a wooden sled can result in several children being injured.
题目中数量关系有点乱啊 孩子们in the past用木头的，10 years ago用塑料的 最后又说塑料更危险是因为last winter 受伤的孩子比10years ago多。。。什么什么啊。。。
正答是C 我选的E

sdcar2010

numbers and percentages.

The stimulus says the number of injured children while sledding are higher than before. But the conclusion says that the percentage of injured children are higher when using plastic sled than using wooden sleds. This is a scope change. The stimulus assumes that both sleds are used in identical conditions.

To weaken the conclusion, you need to point out the above assumption is wrong. C is right.

E actually strenthens the conclusion.

ssxxtt27

numbers and percentages.

The stimulus says the number of injured children while sledding are higher than before. But the conclusion says that the percentage of injured children are higher when using plastic sled than using wooden sleds. This is a scope change. The stimulus assumes that both sleds are used in identical conditions.

To weaken the conclusion, you need to point out the above assumption is wrong. C is right.

E actually strenthens the conclusion.

-- by 会员 sdcar2010 (2011/4/17 21:13:13)

明白了！