Passage 1

21.【答案】C。解析：推理题。根据第二段When AIDS virus finds a T4 cell, it actually connects to a part of the cell called CD4 protein. 可知这样做是别人AIDS病毒接触到真正的T4淋巴细胞，实际上是阻止AIDS病毒的传播。故选C。

22.【答案】D。解析：细节题。根据第一段的第五句There it directs the cells’ genetic material to produce copies of the AIDS virus. 故选D。

23.【答案】D。解析：细节题。根据最后一段Scientists use the genetic engineering methods to make the clones. 可知D项正确。

24.【答案】D。解析：细节题。根据最后一段最后三行That report was based on tests with blood cells grown in labs. The technique is just now beginning to be tested in animals. 可知这项新技术还在测试中，并没有用于临床实验。故选D。

25.【答案】B。解析：主旨题。通读全文尤其是主题段第一段可知文章介绍了一种新的治疗AIDS病的疗法。故选B。

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