下列溶液，一定呈中性的是（ ） A．c（H+）=1×10-7mol/L的溶液 B

读短文，判断正(T)误(F)。

      Hello, I'm Lisa. Today is National Day. And it's my birthday, too. I get up early and clean my room. I invite

(邀请) my friends Amy, Joy and Sarah to my home. We have a birthday party. I know Amy's birthday is in next

month. Joy's birthday is in December. Sarah's birthday is January 1st.

( ) 1. Today is October 1st.

( ) 2. Lisa is having a birthday party.

( ) 3. Lisa's birthday is in December.

( ) 4. Amy's birthday is in November.

( ) 5. Sarah's birthday is New Year's Day.

全身炎症反应失控的可能机制包括（）

A.双相预激假说

B.代偿性抗炎症反应综合征

C.基因多态性假说

D.胃肠道假说

E.免疫功能失调

电能是由其他形式的能转化来的能源，它最终还要转化为光能﹑内能﹑动能等其他形式的能，才能为人类所用．电能是 _________ 次能源．人类使用电能，是因为电能便于 _________ 和 _________ ．请你依次写出我们生活中常用的将电能转化为光能、内能、动能的用电器各一个： _________ 、 _________ 、 _________ ．

氧气是可燃气体。