题目:
It's cold outside, but everyone ______ a good time. [ ]
A. has
B. have
C. are having
D. is having
答案:
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答案:A题目分析:化合反应:由多种物质生成另一种物质的反应,①焦炭充分燃烧的方程式:C + O2点燃 CO2,化合反应,②灼热的焦炭和二氧化碳反应:C + CO2高温 2CO,化合反应,③高温煅烧石灰石:CaCO3CaO+...