安全电压的制定是根据人体允许电流和人体电阻来决定的。

自制原始凭证要有（）签字或盖章。

A、经办部门的负责人

B、出纳人员

C、记账人员

D、经办人员

纳米(nm) 是一种长度单位，1nm =10^-9m ，纳米科技开辟了人类认识世界的新层面。纳米材料科技是纳米科技最基本的组成部分，把固体物质加工到纳米级(1nm~100nm) 的超细粉末，即可得到纳米材料。这种加工过程属于  [     ]

A. 物理变化                  

B. 化学变化  

C. 既有物理变化又有化学变化  

D. 既不是物理变化又不是化学变化

阅读理解。

     As everybody knows, tourism plays an important part in the development of a country's economy, the life

of the nation and international cooperation. Individually, it can enlarge our personal perspective and knowledge,

and make us feel good.

     However, tourism can also lead to pollution and the destruction of places of interest, which is difficult to

avoid.

     Fortunately, "Green Tourism" is now being promoted and developed all over the world. As time goes by,

people will begin to realize the importance of these places of interest. "Green Tourism" teaches people to love

nature more and to consciously protect it by enjoying its beautiful scenery and learning more about it. "Green

Tourism" is the best kind of tourism as its purpose is to appreciate and research natural environments including

wild plants and animals, and of course the cultures of many places.

     Compared with traditional tourism, the main characteristic (特色) of "Green Tourism" is learning more

about nature and people. Traditionally, people travel the world to amuse themselves and pass time pleasantly.

But "Green Tourists" are different. They travel because they are attracted by the characteristics of protected

areas. They want to make good use of natural resources but not use them up. For example, they research the

wildlife, the culture and the customs or a place so that they can learn more about the history and value of the

area.

     In short, "Green Tourism" has a purpose and a plan, but not to pollute or destroy our places of interest.

1. What would be the best title for the text?

A. Green Tourism

B. The Difference between Green Tourism and Traditional Tourism

C. Travel Habits Are Changing

D. How to Have a Good Journey

2. The underlined word "promoted" in the third paragraph probably means ____.

A. raised

B. pushed

C. encouraged

D. advanced

3. Which of the following is NOT the difference between Green Tourism and Traditional Tourism?

A. Green Tourism can enlarge people's personal perspective and knowledge and make them feel good.

B. The main characteristic of Green Tourism is learning more about nature and people.

C. Traditional tourism is to amuse people themselves and make them pass time pleasantly.

D. Traditional tourism can lead to more pollution and the destruction of places of interest than Green Tourism.

4. From the passage we know that the author is most probably ____.

A. a supporter of tourism

B. a supporter of Traditional Tourism

C. a supporter of Green Tourism

D. a lover of tourism

在媒体口中，“哥”和“姐”之类的称谓都有一种非正式的______：既包含某种拉近距离的______，仿佛所有这些人都是我们的兄弟姐妹；又有某种调侃和嘲讽的______，仿佛这些人让社会有了一个宣泄自己的出口。
依次填入划横线部分最恰当的一项是( )。

A．含义 幽默感 随意感
B．意味 亲切感 幽默感
C．口吻 真实感 幽默感
D．内涵 亲近感 距离感

茯苓具有的功效是（）

A.清热，除痹

B.消肿，散结

C.止咳，除痹

D.渗湿，健脾，宁心

E.止呕，通乳