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问题 单项选择题 A3/A4型题

患者，男性，48岁，因“突发胸痛2小时”就诊。2小时前无明显诱因出现胸痛，位于心前区，性质为压榨性，向左肩放射，持续约3分钟自行缓解。初步诊断：冠状动脉粥样硬化性心脏病：心绞痛。

目前确诊冠状动脉粥样硬化性心脏病的金标准是（）

A.心脏X线检查

B.心电图

C.放射性核素检查

D.冠状动脉造影

E.超声心动图

答案

参考答案：D

多项选择题

下列哪些因素决定Ig同种型抗原性的差异()

A．CH氨基酸组成不同

B．CL氨基酸排列顺序不同

C．CH氨基酸排列顺序不同

D．CL氨基酸组成不同

E．VH含糖种类和数量不同
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问答题

Internet is a vast network of computers that connects many of the world’s businesses, institutions, and individuals. (46) The Internet, which means interconnected network of networks, links tens of thousands of smaller computer networks. These networks transmit huge amounts of information in the form of words, images, and sounds.
The Internet has information on every topic.(47)Network users can search through sources ranging from vast databases to small electronic" bulletin boards", where users form discussion groups around common interests. Much of the Internet’s traffic consists of messages sent from one computer user to another. These messages are called electronic mail or e-mail. Internet users have electronic addresses that allow them to send and receive e-mail. Other uses of the network include obtaining news, joining electronic debates, and playing electronic games.(48)One feature of the Internet, known as the World Wide Web, provides graphics, audio, and video to enhance the information in its documents. These documents cover a vast number of topics.
People usually access the Internet with a device called a modem. Modems connect computers to the network through telephone lines. Much of the Internet operates through worldwide telephone networks of fiber-optic cables(49) These cables contain hair-thin strands of glass that carry data as pulses of light. They can transmit thousands of times more data than local phone lines, most of which consist of copper wires.
In the future, the internet will probably grow more sophisticated as computer technology becomes more powerful. (50)Many experts believe the Internet may become part of a larger network called the information superhighway. This network, still under development, would link computers with telephone companies, cable television stations, and other communication systems. People could bank, shop, watch TV, and perform many other activities through the network.
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