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题库 / GMATLA-CR-76
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 few children still use traditional wooden sleds.
Very few children wear any kind of protective gear, such as helmets, while sledding.
Plastic sleds can be used in a much wider variety of snow conditions than wooden sleds can.
Most sledding injuries occur when a sled collides with a tree, a rock, or, another sled.
Because the traditional wooden sled can carry more than one rider, an accident involving a wooden sled can result in several children being injured.
果：在塑料板变得流行的情况下（用的人多了才叫流行），更多的小孩受伤。 因：塑料板让小孩受伤的概率变大，比木头更危险 （当然得是在十年前和去年玩滑雪的小孩的人数大致一样的情况下）
某件事物风险越大，出事儿的概率就越大，如同样的钱放余额宝和股票，股票赚的快亏得也快
他因：塑料板扩大了玩儿的范围，打破了单一变量原则，好比两个风险相差无几的理财产品一个1千起步另一个要2万，后者自然可能带来更多的损失
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