如图，若用半径为9，圆心角为120$°$的扇形围成一个圆锥的侧面（接缝忽略不计），则这个圆锥的底面半径是                                      （   ）

看句子，连线。

① Howis your mother?                      A. Youare welcome.____

②Thank you.                                         B. No, I haven't.____

③Have you got enough food?                C.I was in Shanghai.____

④What did you do last Sunday?             D. We watched TV at home.____

⑤Where were you two days ago?             E. Sheis very well.____