No medicine or treatment now exists for the disease. Recently, however, American researchers announced progress in developing a medicine to prevent Ebola hemorrhagic fever in monkeys. The scientists gave eight monkeys a small but deadly amount of the Ebola virus. They gave an experimental vaccine (疫苗) to only four of them. The monkeys that did not receive the vaccine died within a week. The vaccine prevented the disease from developing in the four monkeys that received it. All the four monkeys were healthy six months later.

　　The researchers said this was the first time a vaccine had protected animals similar to humans from the deadly Ebola virus. They will continue to test the vaccine on animals by giving them increasingly strong amounts of the virus.

　　1. The first symptom of Ebola hemorrhagic fever is ______.

　　A. high body temperature B. serious bleeding

　　C. severe body hurting

　　D. organ failure

　　2. The Ebola virus can cause death quickly mainly because _________.

　　A. it causes a great deal of suffering

　　B. it causes people to lose much blood

　　C. the body’s defense system hasn’t time to act against it

　　D. it can easily produce viruses in people’s bodies

　　3. From the passage we can learn that _________.

　　A. the Ebola virus was originally found in Africa

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