单质的的氧平衡等于以碳完全转化成CO2（或CO）、氢转化为H2O所需的氧的分子数、氮

阅读理解。

     Asking for information or help is a very common and necessary activity, especially when we visit a

foreign country. So knowing how to ask for information politely is important. In English, "Where are the

restrooms?" and "Could you please tell me where the restrooms are?" are similar requests-both are correct

English, but the first could sound rude. It's important to use correct language, but sometimes this alone is

not enough-we need to learn how to be polite when we make requests.

     In English, just like in Chinese, we change the way we speak when talking with different people. The

expressions you use might depend on whom you are speaking to or how well you know them. If you say

to your teacher, "Where is my book?" this will sound rude. But if you say, "Excuse me, Mr West. Do you

know where my book is?" your question will sound much more polite. On the other hand, it might be alright

to say "Where is my book?" in some situations, perhaps with people you know well.

     And you would not usually say, "Peter, lend me your pen." A very direct order like this can sound rude

in English. Usually in English polite questions are longer and include extra language, such as "Could you

please...?" or "Can I ask...?" It sounds more polite to say, "Peter, could you please lend me your pen?"

Sometimes we might even need to spend some time leading in to a question or request. For example, if you

stop a stranger in the street, we might first say, "Excuse me. I wonder if you can help me." or "I'm sorry

to trouble you but," before asking them for help.

     It might seem that speaking politely is more difficult than being direct, and in a way this may be true.

However, in order not to offend people, learning about the language etiquette is just as important as learning

grammar or vocabulary. And doing this will also help you become better at English, or any other language

you wish to speak.

1. It's important to know how to ______ in English when we visit a foreign country.

2. When you talk with different people, you need to ______.

3. Extra words are used to help ______.

4. ______ is as important as learning language structure.

5. How do you say "Don't smoke here." politely? ______

EAN码中由厂商自行制定的码是从右（）数字。

A.第8位至第12位

B.第4位至第7位

C.第4位至第l2位

D.第8位至第13位

盂肱韧带向下止于肱骨体的（）

A、大结节

B、小结节

C、三角肌粗隆

D、大结节嵴

“见人初解语呕哑，不肯归眠恋小车。”出自韦庄的笔下。充满爱意，将诗中的主角活灵活现地展现给了读者。请问诗中的主角是韦庄的什么人？