The British used radio waves because they ________.

A . digital codes B . code messages C . norse codes D . distress message

A . 5 B . 10 C . 14 D . 20

A . DSC B . MSI C . EGC D . NBDP

A . frame monitoring B . radio scan C . self-healing D . client walkabout

A . sound signal B . light signal C . visual signal D . radiotelephone

A .  8 B .  14 C .  23 D .  7 E .  19

A . slang B . secret codes C . procedure words D . analogie

A . devices B . ids C . configure D . report

A . a few centimeters B . a few fathoms C . a few meters D . a few feet

A . 802.11b/g B . radio C . access point D . 802.11a

A . Devices B . IDS C . Configure D . Report

A . 802.11b/g B . radio C . access point D . 802.11a

There are many【C3】______which can help you. For example, in fair weather the air pressure is generally【C4】______. The air is still and often full of dust. Faraway objects may look【C5】______. But when a storm is gathering, the pressure【C6】______and you are often able to see things【C7】______clearly. Sailors took note of this long ago and came【C8】______with a saying "The farther the sight, the nearer the rain." Your sense of【C9】______can also help you find weather changes. Just【C10】______it rains, odours become stronger. This is【C11】______odours are suppressed in a fair, high-pressure center. When a bad weather low moves【C12】______, air pressure lessens and odours are【C13】______. You can also hear a(n)【C14】______storm. An old saying【C15】______it this way: "Sound travelling far and wide, a stormy day will betide." And don't【C16】______if your grandfather says he can【C17】______a storm coming. It is commonly known【C18】______many people feel pains in their bones when the humidity【C19】______, the pressure drops, and bad weather is on the【C20】______. 【C1】 A．if B．unless C．though D．as

We don't know what the effects would be on healthy human cells, Marinelli told New Scientist magazine. In the Italian study, after 24 hours 20 percent more leukemia cells died than healthy cells but longer exposure to the radio waves triggered genes in the surviving cancer cells to divide aggressively. The results of the study do not show any direct threat to human health but they support the belief of some scientists who say radiation can damage DNA and destroy the cell repair system, thus making tumors more deadly. But animal studies, including recent research by Australian scientists at the Institute of Medical and Veterinary Science in Adelaide, have shown that radiation from mobile phones does not trigger the growth of tumors. The WHO (i.e., The World Health Organization) has called for more research into the potential health hazards of mobile phones and has urged people to limit their use of them. A British government inquiry, which concluded that there was no evidence that mobile phones are a danger to health, has advised parents to discourage their children, whose brains are still developing, from using them excessively. What is the speaker's main topic？ A．Effects of using mobile phones on healthy human cells. B．Risks of developing cancer involved in the use of mobile phones. C．Damage to healthy cells caused by the use of mobile phones. D．The potential health hazards of mobile phones on humans.

There can be no doubt that the growth in advertisement is one of the most striking features of the western world in this century. Many businesses such as those handling frozen foods, liquor, tobacco and medicines have been built up largely by advertisement. We might ask whether the cost of advertisement is paid for by the producer or by the customer. (19) Since advertisement forms part of the cost of production, which has to be covered by the selling price, it is clear that it is the customer who pays for advertisement. However, if large scale advertisement leads to increased demand, production costs are reduced, and the customer pays less. It is difficult to measure exactly the influence of advertisement on sales. When the market is growing, advertisement helps to increase demand. When the market is shrinking, advertisement may prevent a bigger fall in sales than would occur without its support. What is clear is that businesses would not pay large sums for advertisement if they were not convinced of its value to them. Advertisement is often used to______. A．deceive customers B．increase production C．arouse suspicion D．push the sale

A．can music B．box musi C．canned music D．boxed music

A．British Broadcasting Cooperation B．British Broadcasting Company C．British Broadcasting Corporation D．British Broadway Cooperation

We might ask whether the cost of advertising is paid for by the manufacturer or by the consumer.Since advertising forms part of the cost of production, which has to be covered by the selling price, it is clear that it is the customer who pays for advertising.However, if large scale advertising leads to increased demand, production costs are reduced, and the customer pays less. It is difficult to measure exactly the influence of advertising on sales.When the market is growing, advertising helps to increase demand.When the market is shrinking, advertising may prevent a bigger fall in scales than would occur without its support.What is clear is that businesses would not pay large sums for advertising if they were not convinced of its value to them. (1).Advertising is often used to (). A.convince customers B.promote production C.rise interest D.push the sales (2).According to the passage, trade fairs (Paragraph 1) may () . A.replace exhibitions and markets supply B.local goods and services C.attract possible customers D.provide cheap amusements (3).Advertising is in the main paid for by () . A.the customer B.the producer C.the increased sales D.the decreased costs (4).The author says that advertising can increase demand (). A.in any period of sales B.in any circumstances C.in a growing market D.in a shrinking market (5).What the last sentence of this passage actually tells us is that (). A.businessmen usually do not pay more for advertising than they have to B.businessmen know well that advertising could bring them more profits C.advertising couldn’t convince people of the value of the goods advertising usually costs D.businessmen large amounts of money