2014年12月英语六级听力冲刺练习16
英语六级听力部分算是同学们考试时的难点吧。听力这部分不能急于求成，需要时间来练习。对于这部分同学们平时在积累词汇的基础上多加练习就可以，听的多了就能掌握技巧，距离12月份的四六级考试还有一段时间，同学每天练习一点听力，考试时听力就能取得高分了。听力音频点击下载.mp3
听力材料：
Scientists searching for a cure for AIDS say theyhave uncovered the basic chemistry of the HIVvirus and that the most likely strategy for fightingthe disease will be attacking it with another virus.
For almost a quarter of a century, scientists aroundthe world have been trying to find a cure for the disease that has so far killed millions. The UNestimates that more than 2 million people were newly infected with the AIDS virus last year,more than half in sub-Saharan Africa. Researchers have developed a range of medicines thatcan substantially prolong the life of HIV-positive patients, but their high price is keeping themoutside of reach of many.
So scientists at the University of Miami are taking a different approach to attacking the virus.
In 2008, a patient in Berlin, Germany, was cured of HIV when he received a mutated geneduring a bone marrow transplant from a donor naturally resistant to HIV.
Director of the Center for AIDS Research at the University of Miami, Mario Stevenson, saidresearchers are now trying to find a way to deliver the mutated gene on a large scale.
“Although we can't use bone marrow transplant to eradicate HIV, it has given us clues on howwe would approach a cure strategy. It's given us a better understanding of what the virus isdoing in the body of individuals who are on therapy, and it has given us the sort of obstaclesthat we need to overcome in order to eradicate the virus,” he said.
Stevenson said an effective method would be to develop a harmless virus that could transferthe mutated gene directly into the HIV virus. With this approach, he said, the scientists arebeginning to see a possible cure.
“The basic science efforts that many of us have been engaged in have started to reveal whatthe ingredients of a cure would look like, what the obstacles to a cure look like, and what asuccess story might look like,” he said.
Scientists have to make sure that the delivery virus will be absolutely harmless, but they saythe approach looks very promising. They predict it’s just a matter of time before there is avictory in the war against AIDS.
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