题干
—I didn't hear you come in just now.
—That's good. We tried __________ any noise, for you were sleeping.
A：not make
B：not to make
C：to make
D：making
答案(点此获取答案解析）
B
，点
在△ABC的内部及边界运动，则
( )
含有氧气分子的是（ ）