采用国标方法进行胡萝卜素的测定时，采用下列哪一项溶剂作为提取液（）。A.丙酮 B.石

阅读理解。

     If you can speak English, you know a lot of English words. You can read, speak and understand.

But there is another kind of language you need to know — the language of the body.

     All over the world, people "talk" with their hands, with their heads and with their eyes. When

Japanese people meet, they bow. When Indians meet, they put their hands together. What do

Americans and British people do?

     Americans are more informal (不拘礼节的) than the British. They like to be friendly. They use

first names, ask questions and talk easily about themselves. When they sit down, they like to relax in

their chairs and make themselves comfortable.

     British people are more reserved (矜持的). They take more time to make friends. They like to

know you before they ask you something of your home.

     When British and American people meet someone for the first time, they shake hands. They do

not usually shake hands with people they know well. Women sometimes kiss their women friends,

and men kiss women friends. When a man meets a man friend, he just smiles, and says "Hello". Men

do not kiss each other or hold hands. Even fathers and sons do not often kiss each other. 

1. We can learn from the passage (一段文章) that people _____.

A. use body language more than words

B. shake hands and kiss each other when they meet.

C. communicate(交流)with each other using both words and body language

2. Indian people usually _____ when they meet.

A. bow to each other

B. put their hands together

C. shake hands and say hello to each other

3. It's easier to make friends with Americans because _____.

A. they are more outgoing

B. they make themselves comfortable

C. they like to rest in their chairs

4. British people take more time to make friends because _____.

A. they are slow to show their feelings

B. they don't like people to go to their homes

C. they find it more interesting to stay alone

5. In the USA and Britain, _____.

A. People usually shake hands with their friends

B. men always kiss their women friends when they meet

C. women are more likely to kiss each other while men aren't

需将腕关节置于掌屈位的是（）。

A.手背烧伤

B.前臂或手的环形烧伤

C.上肢届侧烧伤或环形烧伤

D.上肢伸侧烧伤或环形烧伤

E.腋部、胸、背部、侧胸壁、上臂烧伤

即使在“0”、“1”不等概率出现情况下，以下哪种码仍然不包含直流成分（）

A、AMI码

B、双极性归零码

C、单极性归零码

D、差分码

目前国内外对劳动强度分级的能量消耗指标有（），（）；（），（），（）等。