若三个平面两两相交，且三条交线互相平行，则这三个平面把空间分成[ ]
A.5部分
B.6部分
C.7部分
D.8部分
答案：C
分别标出下列电荷的正负。
在下列各句的空白处填上一个词，使句意合理，语法正确。
1. The food in the small restaurant is both delicious and cheap, so it can _ many people every day.
2. seats also make customers want to leave;
3. study ways can make students get good grades easily.
4. We brush our teeth with toothbrushes and _ .
5. Some parents would rather _ (give) their children money instead of _____ (make)
breakfast for them.
