题目内容：
Directions：In this section,there is a short passage with 5 questions or incomplete statements．Read the passage carefully．Then answer the questions or complete the statements in the fewest possible words on Answer Sheet 2． Qusetions are based on the following passage．
注意：此部分试题请在答题卡2上作答。
If the drug proves effective in human trials，it could enhance the effectiveness of existing AIDS drugs in___________________.
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