At what time was the story set?

　　A. An early winter morning

　　B. A cold winter afternoon

　　C. An early summer morning

　　D. A windy summer afternoon

　　2. Which of the following words best describe the writer’s impression of the town?

　　A. cold and frightening

　　B. dirty and crowded

　　C. empty and dead

　　D. unusual and unpleasant

　　3. The underlined word “trickling” in the last paragraph means_______________

　　A. rushing out suddenly

　　B. shining brightly

　　C. flowing slowly in drops

　　D. appearing slowly

　　4. Why didn’t the man raise his head when the writer came near?

　　A. He was annoyed at being seen by the writer. B. He was angry at being disturbed by the writer.

　　C. He was probably fast asleep.

　　D. He was probably murdered.

　　B

　　Two University of Oklahoma scientists are starting research that they hope will someday lead to the development of a vaccine (疫苗) to fight against the HIV virus, which causes AIDS.

　　The research, to be carried out by Mark Lang, an assistant professor and microbiologist John West, will examine the basic aspects of the immune (免疫) system, rather than the complex aspects of the virus.

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