6.
选出句子的正确答语。⑴ What are the birds doing? A. There are twenty-one birds.
⑵ How old are you? B. Yes, I do.
⑶ Are there any toys in the box? C. They are singing happily.
⑷ How many birds can you see? D. No,there aren't.
⑸ Do you like cars? E. I'm ten years old.