英语四级考试仔细阅读每日一练(12.17)

　　1. If the drug proves effective in human trials, it could enhance the effectiveness of existing AIDS drugs in__________

　　2. What has become standard cocktail therapy?

　　3. While integrase deletes an immune cells genetic material and replaces it with its own, it acts like__________in a word processor.

　　4. Why would anti-AIDS drugs stop working?

　　5. According to Steven Young, if scientists get the data that__________, they would petition for fast track status.