冷箱系统压差过大、温度分布异常的可能原因是（）。A．冷箱系统压力过高 B．冷箱系统压

.Three-fourths of the surface of the earth_________sea.

A．is

B．are

C．were

D．has been

提升容器高速运行时，提升机发生保险制动，应（）。

A.立即停车检查钢丝绳及连接装置

B.将容器缓慢送到终点检查钢丝绳及连接器

C.追究事故责任者的责任

D.交班后处理

How to Beat On-line Credit-card Thieves

The Internet has led to a huge increase in credit-card fraud. Your card information could even be for sale in an illegal web site.

Web sites offering cheap services should be regarded with care. On-line shoppers who enter their credit-card information may never receive the goods they thought they bought.

The thieves then go shopping with your card number--- or sell the information over internet.

Computers hackers（黑客） have broken down security（安全） systems raising questions about the safety of cardholder information. Several months ago, 25,000 customers of CD Universe, and on-line music retailer（批发商）, were not lucky. Their name, addresses and credit-card numbers were posted on a web site after the retailer refused to pay US $157,828 to get back the information.

Credit-card firms are now fighting against on-line fraud. Master-card is working on plans for Web-only credit card, with a lower credit limit. The card could be used only for shopping on-line. However, there are a few simple steps you can take to keep from being cheated.

Ask about your credit-firm’s on-line rules. Under British law, cardholders are responsible for the first US $78 of any fraudulent spending.

And shop only at secure sites: Send your credit-card information only if the web site offers advanced secure system. If the security is in place, a letter will appear in the bottom right-hand corner of your screen. The web site address may also start the extra “s” stands for secure.

If you still have any doubt, give your credit-card information over the telephone.

Keep your password safe: Most on-line sites require a user name and password before placing an order. Treat your password with care.

小题1:What do most people worry about the Internet according to this passage?

A．fraud on the Internet

B．computer hackers

C．illegal web site

D．shopping on line小题2:How many pieces of advice does the passage give to you?

A．1

B．2

C．3

D．4小题3:You are shopping on the web and you want to buy a TV set, what does this article suggest doing?

A．You can go to the website and buy it without doubt.

B．Send your credit card information as soon as the web asks you to do so.

C．Give your credit card information over telephone if you have doubt.

D．Don’t pay money until your TV set is sent to you.小题4:Which of the following is TRUE according to the passage?

A．Computer hackers sold the retailer’s information to a web site to get money.

B．A reliable website offers you an advanced secure system.

C．You can depend on the password to protect your information.

D．The on-line credit-card thieves stole your credit-card and paid with it.

2008年，在社会各界的广泛关注和大力支持下，经过网络投票、专家评审、组织审核、社会公示等各个评选环节，首届“中国十佳大学生村官”评选结果正式揭晓。“大学生村官”们用他们的事迹告诉我们，在我国（）

A.集体主义是每个人都应遵循的价值取向

B.要实现社会价值就不应考虑个人利益

C.集体主义价值观能够彻底解决市场经济运行中出现的所有矛盾

D.要实现人生价值，就必须正确处理好贡献与索取的关系

量可以用容积流量或质量流量表示，风机流量是指（）。