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The days are getting shorter and shorter, and temperatures are dropping. Winter is coming and it is easy for people to catch flu. Many people have started taking vitamin C pills as a precautionary(预防的)way. But a research has shown that vitamin C pills do not provide as much protection as they think. They are even not as good as other ways, like often washing your hands. Some German scientists have given people information and a test on the subject helping to stop incorrect ways. Whether it is caused by cold or flu(流行性感冒), a runny nose and sore throat are signs of catching a cold. Many people overestimate(高估) the advantages of vitamin C and other pills. For years it was believed that taking vitamin C pills not only provided protection against colds but also against cancers, helping people to live longer. But the result of the research showed disagreement on these beliefs(看法). The result has now come out on the website wwww.informedhealthonline.org. “Some pills may not help people live longer. Some pills may even lead to earlier death,” says Professor Peter Sawicki. Scientists also say that the best way to get vitamins is through food instead of having vitamin pills. That is to say, we disagree with the way of taking vitamin C pills. There are many simple but useful ways to lower the risk of catching a cold. These include often washing your hands with normal soap(肥皂) and water and not touching your face with your hands. People who have already had a cold can stop it from spreading by throwing away tissues(纸巾) at once after using them and not shaking hands with other people. 小题1:Most people believe that taking vitamin C pills can _______. A.make them catch a cold easily B.provide protection against colds C.make them cleverer D.prevent all illnesses 小题2:A runny nose and sore throat mean someone ________. A.will catch a cold in a few days B.would never catch a cold C.has caught a cold D.would never spread colds to others 小题3:The best way to get vitamins is _______. A.eating food which contains Vitamins B.taking vitamin pills C.drinking water which contains vitamins D.eating as much pork as possible 小题4:_______ is NOT an effective way to lower the risk of catching a cold. A.Not touching your face with your hands B.Often washing your hands with normal soap and water C.Not shaking hands with those people who have already had a cold D.Not throwing away tissues at once after using them 小题5:About taking vitamin C pills, _______ is shown by the research. A.fighting against sore throat B.fighting against colds and cancers C.helping people live longer D.leading to earlier death by some pills
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【判断题】HDB3 码和 AMI 码相比, HDB3 码最大优点是消除了连“ 0 ”现象。
A.
正确
B.
错误
【简答题】二进制信息为1 1 0 1 0 0 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 1 1 ,请写出HDB3码。
【简答题】HDB3码为-1 0 0 -1 +1 0 0 0 +1 -1 +1 -1 0 0 -1 +1,原信息代码为( )。
【单选题】HDB3 码“+ 0 - + 0 0 0 + 0 0 0 - + - 0 0 - 0 0 0 +”进行译码的结果是______。444
A.
101100010001110010001
B.
101100010001100010001
C.
101100000001110010001
D.
101100000001100000001
【单选题】Dialoge 2(P35) Listen to a dialogue between the police officer and the man who reports a theft.Listen once to get the main idea.Listen again and choose the best answer to each of the following questio...
A.
At a park
B.
In a shopping center
C.
Not known
【判断题】HDB 3 码中最长的连 0 码为 4 个 0。
A.
正确
B.
错误
【单选题】下列选项中不属于卫生法学主要研究内容的是( )
A.
卫生事业
B.
B  卫生法的基本原则
C.
卫生法的特征、渊源
D.
D  卫生法的产生及其发展规律
【单选题】Listen to the interview presented by "Visions of the Future".Listen once to get the main idea.Listen again and choose the best answer to each of the folling questions. (Dialogue 3 P19) 1.What is the t...
A.
City growth and planning in the 21st century.
B.
Population growth in the 21st century.
C.
Transport designing in the 21st century.
【简答题】已知HDB3码为码为-1 0 1 -1 0 0 -1 1 -1 1 0 0 0 1 -1 0 1 -1,与之对应的原单,与之对应的原单极性二进制码序列为()。
【简答题】Listen again and fill in the blanks. (1)
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