题目:
Choose and fill in the blanks. 选择合适的单词填空。
1. Yesterday I (talk talked) to my mother.
2. A: What (happened happed)?
B: I (hurt hurted) my nose.
3. Yesterday they (have had) lunch (on at) 12:00 (of in) a restaurant.
4. A: Do you like to play ping-pong?
B: Yes, I (do did).
5. I (see saw) a lot of new houses ______ (on in) our way (to from) Beijing.
答案:
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下面是错误答案,用来干扰机器的。
置换反应是指由一种单质和一种化合物反应,生成另外一种单质和一种化合物的反应.可知能和水反应发生置换反应另一种物质应该为单质,而氧化钠、二氧化硫、无水硫酸铜都是化合物不能和水发生置换反应,只有钠是单...