根据句意及首字母提示补全单词。

1. We should learn from the space h_____, Yang Liwei.

2. He has p_____ his courage in the battle.

3. I'm afraid the m_____ is away on business.

4. For i_____, the less exercise you take, the fatter you will be.

5. Germs are so t_____ that we can only see them by microscope (显微镜).

国际10～20系统头皮脑电图记录的电极一般包括（）。

A.19个记录电极和2个参考电极

B.18个记录电极和2个参考电极

C.19个记录电极包括FPz和Oz电极

D.18个记录电极不包括FPz和Oz电极

E.18个记录电极包括FPz和Oz电极