健康成人一次失血量不超过多少毫升可通过人体的代偿使之逐渐恢复而不用输血（） A.60

血清病属于（）

A.Ⅰ型变态反应

B.Ⅱ型变态反应

C.Ⅲ型变态反应

D.Ⅳ型变态反应

E.Ⅴ型变态反应

The home computer industry has been growing rapidly in the United States for the last ten years . Computers used to be large, expensive machines that were very difficult to use . But scientists and technicians have been making them smaller and cheaper while at the same time they have been made easier to use. As a result, their popularity has been increasing as more people have been buying computers for their homes and businesses. Computers have been designed to store information and compute problems that are difficult for human beings to work out. Some have voices that speak with the operators. Stores use computers to keep records of their inventories(库存货物) and to send bills to their customers(顾客) . Offices use computers to copy letters, record business and keep in touch with other offices. People have been using computers in their homes to keep track of the money they spend.

One important new use for computers is for entertainment(娱乐). Many new games have been designed to be played on the computers. People of all ages have been playing these games, People also have been buying home computers to play computer games, watch movies and listen to concerts at home. They have become very popular indeed.

小题1: Computers used to _____.

A．work rapidly

B．be large and expensive

C．be easy to use

D．be used for fun小题2: In recent years , computers are being made ______.

A．larger and more expensive

B．smaller and cheaper

C．more difficult to use

D．to work more slowly小题3: Home computers can be used for ______.

A．writing letters

B．playing games

C．doing business

D．all of the above小题4: Salesmen use computers mainly to ______.

A．check the list of goods and materials that are kept in the store house

B．play games for pleasure

C．talk with their friends

D．write letters

— He is feeling even worse.

— That is because he ________ to follow the doctor's advice then.[ ]

A. rejected  

B. refused

C. objected  

D. promised

解除呼吸道梗阻的方法有（）

A.口咽通气道

B.提颏

C.气管内插管

D.上抬下颌

E.以上全是

据统计，在过去的30年间，最不发达国家的数量从25个增加到49个；发达国家与30个最穷国家人均收入相差至少70倍。贫富悬殊既是世界经济发展的障碍，也是危害世界和平的潜在因素。贫富差距可以通过对发展中国家（）等途径来解决。

①增加援助，减免债务

②推行发达国家的经济发展模式

③开放市场，转让技术

④取消贸易关税和消除贸易壁垒

A.①③

B.①④

C.②③

D.②④