69.What can we know from “See if you can find a problem.”?

　　A. You are always late when you and your friend plan to go out.

　　B. Perhaps your friendship is over because of your problem.

　　C. Your friend is fond of complaining all the time.

　　D. You often refuse to answer your friend’s phone calls.

　　70. When a friendship is over, you may do all the following EXCEPT

　　.

　　A. ask your friends whose fault on earth it is

　　B. talk about how you feel about your friendship

　　C. write a letter to your friend to tell your regrets

　　D. send your greetings to your friend before giving up

　　71. The purpose of this passage is to

　　.

　　A. explain why you lose a friendship

　　B. advise how to end a friendship

　　C. tell you when a friendship is over

　　D. suggest what to do when a friendship is over

　　(E)

　　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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