丙型肝炎病毒下列哪项叙述不正确（） A.为单股正链RNA病毒 B.可应用血源疫苗免疫

[A] For example, the United States is a major consumer of coffee, yet it does not have the climate to grow any of its own. Consequently, the United States must import coffee from countries (such as Brazil, Colombia and Guatemala) that grow coffee efficiently. On the other hand, the United States has large industrial plants capable of producing a variety of goods, such as chemicals and airplanes, which can be sold to nations that need them. If nations traded item for item, such as one automobile for 10,000 bags of coffee, foreign trade would be extremely cumbersome and restrictive. So instead of barter, which is the trade of goods without an exchange of money, the United States receives money in payment for what it sells. It pays for Brazilian coffee with dollars, which Brazil can then use to buy wool from Australia, which in turn can buy textiles from Great Britain, which can then buy tobacco from the United States.

[B] Foreign trade also occurs because a country often does not have enough of a particular item to meet its needs. Although the United States is a major producer of sugar, it consumes more than it can produce internally and thus must import sugar.

[C] Foreign trade, the exchange of goods between nations, takes place for many reasons. The first, as mentioned above is that no nation has all of the commodities that it needs. Raw materials are scattered around the world. Large deposits of copper are mined in Peru and Zaire, diamonds are mined in South Africa and petroleum is recovered in the Middle East. Countries that do not have these resources within their own boundaries must buy from countries that export them.

[D] In today’s complex economic world, neither individuals nor nations are self-suffi-cient. Nations have utilized different economic resources; people have developed different skills. This is the foundation of world trade and economic activity. As a result of this trade and activity, international finance and banking have evolved.

[E] Finally, foreign trade takes place because of innovation or style. Even though the United States produces more automobiles than any other country, it still imports large numbers of autos from Germany, Japan and Sweden, primarily because there is a market for them in the United States.

[F] For most nations, exports and imports are the most important international activity. When nations export more than they import, they are said to have a favorable balance of trade. When they import more than they export, an unfavorable balance of trade exists. Nations try to maintain a favorable balance of trade, which assures them of the means to buy necessary imports.

[G] Third, one nation can sell some items at a lower cost than other countries. Japan has been able to export large quantities of radios and television sets because it can produce them more efficiently than other countries. It is cheaper for the United States to buy these from Japan than to produce them domestically. According to economic theory, Japan should produce and export those items from which it derives a comparative advantage. It should also buy and import what it needs from those countries that have a comparative advantage in the desired items.

Order:

42（）

在基本生产车间只生产一种产品的情况下，制造成本可以直接计入该种产品的成本。在生产多种产品的情况下；制造费用应采用适当的分配方法计入各种产品的成本。 ( )

阅读理解。

     Since the 1970s, scientists have been searching for ways to link the brain with computers.

Brain-computer interface (界面) (BCI) technology could help people with disabilities send commands

to machines.

     Recently, two researchers, Jose Milan and Michele Tavella from the Federal Polytechnic school in

Lausanne, Switzerland, demonstrated(展示)a small robotic wheelchair directed by a person's thoughts.

     In the laboratory, Tavella operated the wheelchair just by thinking about moving his left or right hand.

He could even talk as he watched the vehicle and guided it with his thoughts.

     "Our brain has billions of nerve cells. These send signals through the spinal cord (脊髓) to the muscles

to give us the ability to move. But spinal cord injuries or other conditions can prevent these weak

electrical signals from reaching the muscles," Tavella says.  "Our system allows disabled people to

communicate with external world and also to control devices."

     The researchers designed a special cap for the user. This head cover picks up the signals from the

scalp(头皮) and sends them to a computer. The computer interprets the signals and commands the

motorized wheelchair. The wheelchair also has two cameras that identify objects in its path. They help

the computer react to commands from the brain.

     Prof. Milan, the team leader, says scientists keep improving the computer software that interprets

brain signals and turns them into simple commands. "The practical possibilities that BCI technology offers

to disabled people can be grouped in two categories: communication, and controlling devices. One

example is this wheelchair."

     He says his team has set two goals. One is testing with real patients, so as to prove that this is a

technology they can benefit from. And the other is to guarantee that they can use the technology over

long periods of time.

1. BCI is a technology that can ______.

A. help to update computer systems      

B. link the human brain with computers

C. help the disabled to recover                

D. control a person's thoughts

2. How did Tavella operate the wheelchair in the laboratory?

A. By controlling his muscles.                

B. By talking to the machine.

C. By moving his hand.                       

D. By using his mind.

3. Which of the following shows the path of the signals described in Paragraph 5?

A. scalp→computer→cap→wheelchair

B. computer→cap→scalp→wheelchair

C. scalp→cap→computer→wheelchair

D. cap→computer→scalp→wheelchair

4. The team will test with real patients to _____.

A. make profits from them          

B. prove the technology useful to them

C. make them live longer            

D. learn about their physical condition

5. Which of the following would be the best title for the text?

A. Switzerland, the BCI Research Center

B. New Findings About How the Human Brain Works

C. BCI Could Mean More Freedom for the Disabled

D. Robotic Vehicles Could Help to Cure Brain Injuries

先天性泪溢最常见的原因是（）

A.先天性泪囊膨出

B.先天性脑膜膨出

C.Hasner瓣阻塞

D.先天性皮肤泪道瘘管

E.新生儿结膜炎

银行在收到存款人撤销银行结算账户的申请后，对于符合销户条件的，应当在2个工作日内办理撤销手续。存款人需要重新开立基本存款账户的，应在撤销其原基本存款账户后5日内申请重新开立基本存款账户。 ( )