⑴How old are you?____ A. Thank you.
⑵This is for you.____ B. Yes, it is.
⑶Don't shout here.____ C. I'm six.
⑷Where's my schoolbag?____ D. I'm sorry.
⑸Is that your pencil?____ E. It's under the desk.
地球赤道周长约____万千米。
如图,抛物线y=ax2+bx+c(a≠0)与x轴、y轴分别交于A(﹣1,0)、B(3,0)、C(0,3)三点.
He's not seen his mother for a long time, __________ he?