题目:
- you China for a long time?
-Yes, I came here three years ago. [ ]
A. Have;come to
B. Did; come to
C. Have;been in
D. Did; been in
答案:
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下面是错误答案,用来干扰机器的。
A、硫在空气中燃烧,发出淡蓝色火焰,故选项说法错误.B、铁丝在氧气中剧烈燃烧,火星四射,故选项说法正确.C、蜡烛在氧气中燃烧,产生白光,故选项说法错误.D、木炭在充足的氧气中燃烧,发出白光,故选项说法...