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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.
E哪里不对啊？
要注意问题最后说的undermine the force of the evidence cited，引用的例子是“去年冬天受伤的人数比十年前的多”，去说明“塑料滑板比木滑板更危险”。如果要削弱的话，就得说明“即使去年冬天受伤的人数比十年前的多，塑料滑板也不比木滑板危险”，然后就要想到“塑料滑板的事故率不比木滑板的高”，也就是说“塑料滑板的使用量或者使用范围要比木滑板的高”，所以就是C项。
E项只是单纯地说木滑板危险，没有削弱“从去年受伤人数比十年前多推导出塑料滑板比木滑板”这个推导过程。
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