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 作者: cdwayne 时间: 2011-5-5 01:36
(C) implies the frequency of plastic sleds rises because of the much wider variety of snow; an alternative cause weakens the argument.
(E) if anything, it would strengthen the argument, since the wooden sled hurts more, but the number of children injured is caused by plastic, therefore the plastic is much more dangerous indeed.作者: ashtreeliu 时间: 2011-5-5 03:00
E说木板也能导致小孩受伤的多，结论是塑料板导致的伤害要比木板多，支持木板伤害也多不能去反驳这个近几年因为使用塑料板多而导致的受伤增多这个证据。
所以只能去证明塑料板的减速慢和hard to steer和伤害增多没有必然联系，C项说明了，虽然塑料板在拐弯和减速上不如木板，但相比木板来说塑料板可以使用的场地要更多，所以导致受伤的原因并不一定是由于hard to slow和steer引起的，可能是场地的其它原因导致的伤害作者: elusive 时间: 2016-2-17 12:27
因为塑料受伤多所结论是木头安全。