在运用市场法评估房地产价值时，通过交易日期修正，将可比交易实例价格修正为 ( )的

企业销售收入只有超过其损益分界点时才能为企业带来利润，因此，企业销售数量越多，所获得的利润越多。( )

三个完全相同的杯子甲、乙、丙装有相同质量的水、酒精和汽油，将质量不同的实心铜块、铁块、铝块分别投入甲、乙、丙三个杯子里，最后三个杯子里液面相平（没有液体溢出），则（　　）

A．铝块质量最小

B．铁块质量最小

C．铜块质量最小

D．三块金属质量相等

When I first got an email account ten years ago, I received communications only from family,friends,and colleagues.Now it seems that every time I check my e-mail ,I have an endless seriers of advertisement and otner correspondence that do not interest the at all.If we want e-mail to continue to be useful,we need special laws that make spamming(发送垃圾邮件) a crime.

If lawmakers do not do something soon to prohibit spam，the problem will certainly get much worse。Computer programs allow spammers to send hundreds of millions of e-mails almost instantly 。as more and more advertisers turn to spam to sell their products ，individual（个人的）e-mail boxes are often flooded with spam e-mails。Would people continue to use e-mail if they ahd to deal with an annoying amount of spam each time？

This problem is troubling for inviduals and companies as well. Many spam emails contain computer viruses that can shut down the entire network of a company.Companies rely on e-mail on on e-mail for their Comployees to communicate with each other. Spam frequently causes failures in their local commnications networks, and their employees are thus unable to communicate effectively.such a situationg results in a loss of productivity and requires companies to repeatedly repair their networks.These computer problems raise productton costs of companies ,which are,in the end,passed on to the consumer.

For these reasons,I believe that lawmakers need to legislate (立法) against spam.Spammers should be fined,and perhaps sent to prison if they continue to disturb people.E-mail is a tool which helps people all over the world to communicate conveniently,but spam is destroying this conwenience.

1.What does the underlined word “correspondence” in the Paragraph 1 probably mean?                                                         

A.messages     B.ideas          C.connections         D.programs

2.According to the text, what is the major cause of the flooding spam?     

A.Companies rely on e-mail for communications.

B.More people in the world communicate by e-mail.

C.Many computer viruses contain spam e-mail.

D.More advertisers begin to promote sales through spam.

3.According to Paragraph 3,who is the final victim of spam?            

A. The business                B. The advertiser        

C.The employee               D.The consumer

4.What is the purpose of the text?

A.To inform                 B.To educate                 C.To persuade               D.To instruet

F级电工绝缘材料的极限温度为（）。

A、130

B、150

C、180

患者，男，23岁，工人，操作机器时被飞出的异物碰伤左面部2小时，伤后无昏迷，神志清，查体合作，步入诊室。查体见，左外眦下方至左下颌角皮肤呈直线型裂开，深达肌层，创面可见渗血、无搏动性出血。张口无明显受限、下颌运动尚可。

如检查发现腮腺导管完好，腮腺包膜部分破坏、腺体分泌量较少，应如何处理（）

A.加压包扎

B.抑制分泌

C.腮腺导管改道

D.电凝烧灼

E.缝扎损伤部分包膜