矿井三量包括开拓煤量、（）和回采煤量。
A、损失煤量
B、三下压煤量
C、掘进煤量
D、准备煤量
参考答案：D
My sister has two red ______ . [ ]
A. hat
B. volleyball
C. tennis racket
D. baseballs
Can I open the window?_____[ ]
A. Yes. I can
B. Yes. you can
C. No. you can't
D. Sorry. I can't
