以半圆的直径为轴旋转一周，形成的立体图形为[ ]
A．圆柱
B．圆锥
C．球
答案：C
- I'm going to spend my summer holiday in Hawaii.
- _____[ ]
A. Good luck!
B. Have a good time!
C. That sounds good!
D. Can I go with you?
在Word中打开文档的快捷键是( )。
A．Ctrl+O
B．Ctrl+S
C．Ctrl+N
D．Ctrl+V
