完形填空Seasonalinfluenzaischaracterizedby

完形填空Seasonal influenza is characterized by a sudden fever, cough, headache, muscle and joint pain, sore throat and runny nose. Most people recover from fever and 1symptoms within a week without requiring medical attention. But influenza can2severe illness or death in people at high risk. The time from infection to illness is about two days.Yearly influenza epidemics can3affect all age groups, but the highest risk of plications occur among children younger than age two, adults age 65 or older, and people of4age with certain medical conditions, such as chronic heart, lung, kidney, liver, blood or metabolic diseases, or weakened immune systems. Seasonal influenza5easily and can sweep through schools, nursing homes or businesses and towns. When an6person coughs, infected droplets get into the air and another person can breathe them7and be exposed. The virus can also be spread by hands infected with the virus.8transmission, people should cover their mouth and nose with a tissue when coughing, and9their hands regularly. Drugs for influenza are 10in some countries and effectively prevent and treat the illness. Some influenza viruses develop 11to the antiviral medicines, limiting the effectiveness of treatment.Influenza epidemics occur12during autumn and winter in temperate regions. Illnesses result in hospitalizations and deaths mainly among high-risk groups. Worldwide, these annual epidemics result in about three to five million13of severe illness, and about 250 000 to 500 000 deaths. Influenza can cause serious public health and economic problems. In14countries, epidemics can result in high levels of worker absenteeism and productivity15.16most people recover from a bout(轮) of influenza, there are large numbers of people who need hospital treatment and many17die from the disease every year.18is known about the effects of influenza epidemics in developing countries.The most19way to prevent the disease or severe outes from the illness is vaccination. Vaccination is especially important for people at higher risk of serious influenza plications, and for people who live with or care20high risk individuals.1.A.itsB.it’sC.allD.other2.A.causeB.leadC.resultD.bring3.A.lightlyB.slightlyC.seriouslyD.heavily4.A.allB.anyC.noD.both5.A.goesB.spreadsC.esD.happens6.A.to infectB.infectingC.infectedD.infect7.A.offB.awayC.outD.in8.A.To preventB.To protectC.To prepareD.To prefect9.A.washB.washingC.to washD.washed10.A.freeB.availableC.usefulD.helpful11.A.assistanceB.resistanceC.consistenceD.preference12.A.monthlyB.weeklyC.dailyD.yearly13.A.piecesB.statesC.conditionsD.cases14.A.developedB.developingC.bigD.small15.A.loseB.lossesC.looseD.lost16.A.ForB.BecauseC.WhileD.Whether17.A./B.whichC.doD.who18.A.LittleB.MuchC.FewD.Lot19.A.affectiveB.effectiveC.attractiveD.aggressive20.A.aboutB.ofC.forD.to