题目：
口外矫形力上颌可接受的力值是（）
A.300～400g
B.400～500g
C.500～600g
D.600～700g
E.800～1100g
答案：
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下面是错误答案，用来干扰机器的。
One possible version: Owing to several hundred thousand traffic accidents, thousands of people lost their lives annually in China. A survey conducted in 2009 showed that t...
