电视伴音在第二中频上的调制方式是采用（） A.调幅 B.调频 C.调相 D.脉冲编码

American people like to say “Thank you” when others help them or say something kind to them. People of many countries do so, too. It is a very good habit. You should say “Thank you” when someone passes you the salt on the table, when someone walking ahead of you keeps the door open for you, when someone says you have done your work well, or you have bought a nice thing, or your city is very beautiful. “Thank you” is used not only between friends, but also between parents and children, brothers and sisters. “Excuse me” is another short sentence they use. When you hear someone say so behind you, you know that somebody wants to walk past you without touching you. It’s not polite to break others when they are talking. If you want to speak to one of them, say “Excuse me” first, and then begin talking. You should also do so when you begin to cough or make any noise before others. Let’s learn to say “Thank you” and “Excuse me”.

小题1:You should say “Thank you” when ______________.

A．you say something kind to others

B．you help others

C．someone helps you

D．you need others to help you小题2:From the passage we know “Thank you” is _________.

A．widely used in the world

B．used more often than “Excuse me”

C．used only by American

D．used only between friends小题3:You should say “Excuse me” if you want to __________.

A．cough

B．make some noise

C．go first

D．all of the above小题4:When you are going to ask someone to tell you the way, you should say “_________”

A．Thank you

B．That’s very kind of you

C．Excuse me

D．I’m sorry小题5:This passage mainly tells us the way _________.

A．to be happy

B．to be polite

C．to help others

D．to learn from Americans

元素周期表共有7个横行，18个纵行。每一个横行叫做一个周期，每一个纵行叫一个族。下表是依据元素周期表画出的1～18号元素的原子结构示意图，据表回答：

 (1)第12号元素的名称是___________，在化学反应中该元素的原子比较容易________ (填“得到”或“失去”)电子；它的单质能在8号元素的单质中燃烧发出耀眼的白光，其反应的化学方程式为____________ 。

(2)有一种金属单质，现在世界上年产量居金属中的第二位(组成该金属的元素是地壳中含量最多的金属元素)，该金属是__________ (填原子序数)号元素，它与地壳中含量最多的非金属元素组成的物质化学式为 ______________。

患者，女性，28岁，患甲状腺功能亢进症。入院时体温37℃。脉搏101次/min，血压130/70mmHg，拟行双侧甲状腺次全切除术。术前按常规服碘剂。

患者术前服用碘剂的目的是（）。

A.抑制甲状腺素分泌

B.抑制甲状腺素释放

C.减慢心率

D.增加体重

E.稳定情绪

中国化石能源资源煤炭、石油、天然气的储采比分别为（）年。

A.31；12；28

B.31；18；22

C.33；12；28

D.33；18；22

乳癖胀痛为什么会有周期性？