VOA慢速英语2012.06.19
[audio]http://sound.yywz123.com/tingbbs/voa/voa20120619.mp3[/audio]Studies show that a drug called Truvada can prevent HIV infections. The pill is taken once a day. Studies showed it was ninety percent effective when people took it every day. It was only half as effective when people did not take it every day. 研究表明，一种名为特鲁瓦达的药物可以预防艾滋病毒感染。这种药物每天服用一片。研究表明每天服用该药物，预防率可以达到90%。如果未能坚持每天服用，效果会减半。
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**** Hidden Message ***** Currently in the United States, the drug is only approved for use as a treatment for people already infected with HIV, the virus causes ADIS. Now, a government advisory __ty says Truvada should become the first drug approved for use to prevent HIV. thankyou
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