忘了是PP还是GWD原题：
就是那个Wood sled和plastic sled 的。说Wood sled 速度慢，转向好，但是自从用了plastic sled 之后，小孩受伤的数量上升，所以是因为plastic sled 的原因，问削弱。
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可能是这道题。11th OG Diagnostic Test 20
In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners aend 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 10 years ago.
Which of the following, if ture 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 sleds can carry more than one rider, an accident involving a wooden sled can result in several children being injured.
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我没有OG电子版，版上也没查到这道题，所以是输入的，有错误请指出。
-- by 会员 youming (2009/11/19 14:45:55)
Premises: # of children injured while sledding was higher last winter than 10 years ago
Gap: factors other than plastic sleds could cause the increase in injured children
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发表于 2009-11-21 13:28:47
