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问题 单项选择题

随着网络的出现，网络企业、电子商务、网上销售、网络教育、电子货币、网上资讯等，形成了一种基于国际互联网的壮观经济现象，这一经济现象使得我国经济发展迅速提速。网上购物（）①使货币的职能发生了变化②没有改变货币本身固有的职能③使用的是虚拟货币④使得商品交换的方式发生了变化

A.①②

B.②④

C.③④

D.①④

答案

参考答案：B

单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

It is more and more usual that users of Information Retrieval (IR) systems must face up to response of hundreds or thousands of (1) documents. A significant proportion of them are moreover (2) or redundant. This is a straight consequence of two well - known facts: the incessant growing of documental databases and the lack of ability of most users to define (3) information needs. In such a framework, further effective retrieval techniques are only part of the solution. Interfaces with alternative ways for organizing and (4) the results returned by a (5) would be of great utility assisting users to find relevant documents. Document clustering may play a central role as an effective technique for organizing query results.

4（）

A．seeing

B．searching

C．browsing

D．looking for
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单项选择题

患者，女性，57岁。支气管扩张病史6年。突然出现大咯血，家属估计咯血量约500ml来院急诊。

护士给予的首要护理措施是

A．使用镇静药
B．建立静脉通道
C．使用止血药
D．消除心理紧张
E．保持气道通畅
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