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.
vote for c.原文是在比较塑料和木制sleds的危险性，所以选项也应该会有比较关系隐含才对。b如果说了10年前的小孩都戴安全帽则毫不犹豫地选它。但其实c也有不好的地方，从另一个角度想应用广了反而会加大受伤的危险。所以这道题出得很不严谨，非常不严谨。all in all，c比b好
还是不是很明白啊！
题目意思是说根据了一个受伤的数据更多，就说是怪plastic更难放慢速度造成了，
B不是刚好找到了一个其他原因攻击它吗，说是因为滑雪者自己没有做好措施导致啊！
而C根本无关啊，它说plastic比wood能在更多的下雪环境中被使用，这跟攻击题目无关啊！
我也支持C。
这题是有点怪异……
没选B是因为B虽然是它因说小孩没有防护措施，但这个条件对于用wooden的和用plastic的小孩来说是一样的，所以从本质上并没有排除受伤率多的原因是plastic更危险这个结论。
看题目，说injured was higher 推出 plastic 更危险， 并且plastic更危险是higher injured 的原因，
C有一点断桥的感觉，把这个推出给否定了。
C解释了injured was higher的原因，是因为plastic能在更多的下雪环境中被使用。因为使用的环境多了，所以受伤多也是合理的。这样就削弱了higher injured的原因是plastic更危险。
请参考大N lawyer_1 的解释
http://forum.chasedream.com/dispbbs.asp?boardid=24&replyid=1320832&id=141959&page=1&skin=0&Star=2
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