题干
科技人员成功研制出一种新型催化剂，可将二氧化碳转化成液体燃料，反应的微观示意图如下，有关该反应的说法正确的是（ ）
A：该反应属于化合反应
B：反应前碳元素的化合价为＋2价
C：生成物的化学式可用C2H2O表示
D：参加反应的两物质的质量比为1：1
答案(点此获取答案解析）
A
Today is Sunday. There's no school. It is sunny. Charlie and his father are going to the park. Look. Charlie is riding his bike. He is very happy. His father is sitting under a big tree. He is reading a newspaper. In the afternoon, the weather is bad. It is cloudy. Now it is raining. Charlie and his father have no umbrella. They are running home. But they forget their bike.