experience chest pains and death. There is no known cure for the disease and no way yet to prevent it.

　　Scientists at the American National institutes of Health are working to develop a vaccine(疫苗) to prevent Ebola. Doctor Cary Nobel is leading the research effort at N-l-H testing center in the eastern state of Maryland. He says that during the past two years, the vaccine has been tested on small animals and monkey a for safety and effectiveness.

　　In the most recent study, four monkeys who had been given the vaccine were completely

　　protected from a deadly injection of the Ebola virus. the study was described in November in Nature magazine. Doctor Nobel says the tests appear to have moved scientists one step closer to a vaccine for humans.

　　28. Where does the Ebola virus come from?

　　A. Bats.

　　B. Monkeys.

　　C. Infected humans.

　　D. Something unknown.

　　29. When infected with Ebola virus, people may experience the following except____

　　.

　　A. heart attack

　　B. a rise in temperature

　　C. chest pains

　　D

　　bleeding inside the body

　　30. What can we learn from the passage?

　　A. Once infected with the Ebola virus. people can never survive.

　　B.

　　Half of the Ebola victims will lose their lives.

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