题干
把正确答语前的字母填到横线上
①6How many birds do you see?____
②I'd like car 18,please.____
③What's this?____
④How many balls do you have?____
a. I have 11. b. OK c. My new crayons d. I see 15.
答案(点此获取答案解析）
d,b,c,a
2MgO+C，下列有关叙述错误的是（ ）