⑴May I take your picture?____ A. No, I hurt my arm.
⑵Are you okay?____ B. Yes, he is.
⑶Don't draw or write on the wall.____ C. I'm walking to the hotel.
⑷Is Danny busy?____ D. Sure!
⑸What are you doing?____ E. OK, I'm sorry.
的公比为正数，且
·
=2
，
=1，则
=