A:①②
B:①③
C:②③
D:③④
某同学模拟池塘生态系统制作了如图所示的生态球,将其置于光线良好的地方。
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.