Electronic mail has become an extremely important and popular means of communication.
The convenience and efficiency of electronic mail are threatened by the extremely rapid growth in the volume of unsolicited commercial electronic mail. Unsolicited commercial electronic mail is currently estimated to account for over half of all electronic mail traffic, up from an estimated 7 percent in 2001, and the volume continues to rise. Most of these messages are fraudulent or deceptive in one or more respects.
The receipt of unsolicited commercial electronic mail may result in costs to recipients who cannot refuse to accept such mail and who incur costs for the storage of such mail, or for the time spent accessing, reviewing, and discarding such mail, or for both. The receipt of a large number of unwanted messages also decreases the convenience of elect
A. cheat
B. introduce
C. provide
D. harm
[判断题]中线里程桩不作为施测路线纵、横断面的立尺点和依据。( )
[单项选择]Preparing for Computer Disasters
Fires，power surges，and floods，they’re all facts of life.We read about them in the morning paper and see them on the evening news．We sympathize with the victims and commiserate over their bad luck．We also shake our heads at the digital consequences-melted computers，system failures，destroyed data.Yet，somehow，many of us continue to live by that old mantra of denial：“It won’t happen to me．”Well，the truth is，at some point you’ll probably have to deal with at least one disaster．That’s just how it goes，and in most aspects of our lives we do something about it．We buy insurance．We stow away provisions．We even make disaster plans and run drills．But for some reason，computer disaster recovery is a blind spot for many of us．It shouldn’t be．Home computers contain some of our most important information，both business and personal，and making certain our data survives a disaster should be a priority．Moreover，even the sma
A. never ignored
B. always ignored
C. achieved
D. stimulated
[填空题] Although the Arabian camel, or dromedary, can go without drinking for a long while, its hump(驼峰) does not store water as is commonly believed. The real 【B1】______ of the animal’’s unusual ability to store water 【B2】______ in the fact that very 【B3】______ of the camel’’s water is lost by 【B4】______ through the skin. Instead of 【B5】______ out great quantities of water, the camel’’s body temperature 【B6】______, sometimes as much as eleven degree, to compensate 【B7】______ external heat. When a camel 【B8】______ require water, it replaces only the 【B9】______ lost since its last drink.
In Egypt, 【B10】______ November and April, the camel 【B11】______ go for three or four months without drinking if it 【B12】______ in lush(繁茂的) pastures where dew(露水) and 【B13】______ keep the vegetation green. If only 【B14】 ______ feed is available, the camel will get 【B15】______ after several weeks—even during January.
The 【B16】______ of time a camel can go without drinking is greatly 【B17】______ by
A. A．exhausted
B．tired
C．thirsty
D．hungry
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