2015年12月英语四级听力VOA慢读练习3

英语自学网

    听力部分一直以来都是同学们考试时的难点，也是吐槽最多的部分。暑期想要早点为下半年的四六级考试做准备就来四六级考试网练习一下英语四级听力题吧，考虑四级听力的特点，我们特别准备了VOA的慢速听力材料哦。
　　

20160513035708747.gif

听力音频点击下载.mp3

20160513035708337.gif

听力材料：
　　Researchers say an experimental vaccine hasshown to be "highly effective" at preventing thedeadly disease Ebola.
　　The World Health Organization said Friday that thevaccine has been 100 percent effective at testsperformed in Guinea. The British medical journalLancet has published early test results and analysesof the findings.
　　Norway's foreign minister praised the effectivenessof the new vaccine, calling it "the silver bullet"against Ebola. Norway is one of the several countries involved in the testing.
　　Ebola spread through West Africa last year. The disease killed more than 11,000 people --most of them in Liberia, Guinea and Sierra Leone.
　　Ebola is one of a number of highly dangerous viruses known as hemorrhagic fevers. They canaffect many organs, damage blood vessels and affect the body's ability to fight infection.There are hopes the new vaccine may be a success in fighting against all such diseases.
　　The vaccine is known as VSV-EBOC. Beginning in March, it was tested on more than 4,000people in Guinea. All of them had come into close contact with the Ebola virus.
　　WHO officials say early results were so promising that random tests were stopped this weekso everyone at risk could receive the vaccine immediately.
　　Vaccine could be ‘game-changer'
　　The WHO's general director, Margaret Chan, spoke to reporters in Geneva. She said thatscientists, doctors and drug companies worked together in development of the vaccine.
　　If proven effective, she said, the vaccine "is going to be a game changer." She said it willaffect efforts to control the current Ebola outbreak and future outbreaks.
　　Researchers decided to change their efforts against the disease as the testing began. Onereason was a sharp drop in the number of new cases in Africa over the past few months. Theother was the changing nature of the Ebola epidemic.
　　Last year, the disease spread very quickly over large parts of West Africa. But then it seemedto change, resulting in a series of sudden, small outbreaks across the area.
　　The ideal way for testing a new drug would be to vaccinate half of a population at risk ofcontracting Ebola. At the same time, other people in the virus area would receive a placebo orharmless substance.
　　Instead the team working on the vaccine chose to use a "ring" design. When a first Ebola casewas reported in a village, researchers vaccinated everyone in contact with the sick person. Such"rings" of vaccination took place either immediately after an Ebola infection was confirmed orthree weeks later.
　　Of the 2,014 people vaccinated immediately, no one had Ebola when tested 10 days afterreceiving the new drug. A total of 2,380 people were vaccinated three weeks later. Only 16 ofthem became infected with the virus.
　　Test results will now go to government regulatory agencies. The agencies will decide whether toapprove a license for the vaccine. Such a permit would enable production of the vaccine forfuture Ebola epidemics.
　　There have been a total of 27,748 cases of Ebola in Guinea, Liberia and Sierra Leone. The threecountries have at least 11,279 Ebola deaths. However, the result of many cases is not yetknown, and the real number of death will be higher.