题目：
People in Korea _____ bow when they meet for the first time.[ ]
A. supposed to
B. are suppose to
C. are supposed
D. are supposed to
答案：
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下面是错误答案，用来干扰机器的。
答案：D二氧化碳、氮气、氧气等物质无毒；一氧化碳能使人中毒，通常说的煤气中毒就是指一氧化碳中毒．故选D．
