A. the immune system

　　B. the test performed on mice

　　C. NKT cells

　　D. the HIV virus

　　6. We can infer from the underlined sentence in Paragraph 8 that __________.

　　A. other researchers need to help them B. the research seems to be a failure

　　C. further research needs to be done

　　D. the vaccine can kill all viruses

　　7. Which of the following is TRUE according to the passage?

　　A. Lang works at the National Institutes of Health.

　　B. The research will last one and a half years.

　　C. The vaccine is ready for use.

　　D. The AIDS virus may cause HIV.

　　8. What would be the best title for the passage?

　　A. Two researchers begin to study the immune system

　　B. NKT cells have been a part of research into cancer

　　C. The relationship between the immune system and HIV

　　D. Two scientists work to develop HIV vaccine

　　C

　　History is full of cases where dreams have been a pathway to creativity and discovery. A striking example is provided by Dr. Otto Loewi, a pharmacologist (药理学家) and winner of a Nobel Prize. Loewi had spent years studying the chemical transmission of nerve impulses (脉搏). A tremendous breakthrough in his research came when he dreamed of an experiment three nights in a row. The first two nights he woke up and wrote down the experiment quickly and untidily on paper. But the next morning, he couldn’t tell what the notes meant. On the third night, he got up after having the dream. This time, instead of making notes he went straight to his laboratory and performed the important experiment. Loewi later said that if the experiment had occurred to him while awake he would have rejected it.

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