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Since the first reported case of AIDS in the United States in 1981, the disease has spread both numerically and geographically. According to the World Health Organization, 28 million people in the world already carry the AIDS virus. What is most alarming is that the disease is not only found in homosexuals, prostitutes or drug abusers, but also in innocent people, including children. In some countries in Africa, the situation is very serious indeed.The AIDS virus, now known as HIV, passes from mother to child in uterus, during birth, and possibly through breast-feeding. Because of the high HIV-positive rates among pregnant African women, the AIDS epidemic among children will only grow worse. In Kinshasa, Zaire, for example, eight percent of the pregnant women in a prenatal clinic tested HIV-positive.As many as half the children born to HIV-positive mothers will themselves be infected. Right now in some parts of Africa, five percent of new-borns are HIV-positive, and one-half to two-thirds of those will develop AIDS within two years. In Rwanda, for example, 22 percent of AIDS victims are children. And this year 6,000 Zambian children will be treated for AIDS. Thus AIDS endangers not only this generation of Africans, but the next as well.Besides mother-to-child, AIDS is transmitted to innocent victims in another way. A European doctor in Zambia told this story: Robbers broke into the home of a family and, before escaping with the family’s valuables, shot the two daughters. In saving the young women’s lives, doctors gave them blood transfusions. The blood, however, contained the AIDS virus. Now one of the sisters has AIDS and is dying, and the other is HIV-positive. It has been estimated that over 10 percent of Africans who are HIV-positive are believed to have received the virus through infected blood. In Central Africa that could mean over half a million people.AIDS infects health care workers, too. The Center for Disease Control (CDC) not long ago reported three AIDS infections in health workers, whose skin was exposed to the blood of AIDS patients and have become infected with the AIDS virus. They stressed that there is no evidence that the AIDS virus can pass through intact skin or spread by casual contact. While they do not know the exact route of transmission, CDC officials said that in these three cases the virus may have passed through chapped or inflamed areas of unprotected skin. What is the passage mainly about().
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证券交易所形成的交易价格往往被投机者操纵，不能作为引导资本流动的信号。( )
Questions 14—16 are based on the following talk about the bank credit card.The system of bank credit cards operates in much the same way as a store credit account except that the holder is not restricted to making purchases in one place.Cards can be presented at any place where the bank card sign is displayed, and that could be at a shop, a service station, a hotel, a restaurant or in fact at all kinds of businesses.The sales assistant imprints the card details on to a sales voucher which the customer signs, and the card is then returned to the customer. Each month the bank sends the holder a credit card statement setting out where purchases were made and totaling what is owing. A payment has to be made within 25 days of the date of the statement, but not necessarily the full amount. If the customer pays in full within this time the use of the card does not cost anything. But if he decides to pay only the minimum repayment shown on the statement — $5 or 5% of the outstanding balance, whichever is the greater — he automatically chooses to use the system’s extended repayment facility. The remaining balance is then carried forward and attracts interest at the rate of 2.25% per month.Bank credit cards are more versatile than store credit accounts in that they also enable people to obtain cash. Any bank displaying the bank card sign will arrange a cash advance for a card holder, whether or not he is one of their own customers. For money drawn in this way the bank makes a charge at the rate of 2.25% a month, calculated daily from the day the advance is obtained. Details of cash advances appear on the monthly bank card statement.The bank credit card system operates entirely separately from cheque accounts, but nevertheless it is a customer’s previous relationship with his bank that is used as a guide to the amount of credit he will be extended. When a card is issued a personal credit limit is imposed indicating the maximum that can be owing at any one time. This is confidential between customer and bank and does not appear on the card. What does the bank do when customers buy something using a bank credit card().
The scientists, concerned about the potential hazards, wanted the latest research finding made publicly. A. concerned about B. the latest C. made D. publicly
Despite this similarity with other creatures, the evolution of humankind differs from other species in one important and unique way. A. Despite B. other C. other species D. one
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