Scientists say vaccinating dogs can effectively get rid of rabies outbreaks in dog populations. And this will have a domino effect.But many developing countries do not have dog vaccination systems in place.Therefore，rabies still kills 70，000 people around the world every year.Most victims are children.

　　Animal scientists are calling for mass vaccination of dogs as a way to get rid of rabies.One example of where this worked very well is in the African country of Tanzania.Public health officials there set up dog vaccination centers in 180 villages.Before the vaccination centers were set up，there were，on average，50 rabies deaths every year in Tanzania.After the centers began working，that number dropped to nearly zero.

　　Guy Palmer is the director of the School for­Global Animal Health at Washington State University.He co­authored the study in Tanzania.Mr Palmer says researchers found that vaccinating 70 percent of dogs wiped out rabies as a human threat.

　　5．What does the underlined word “trigger”in Paragraph 1 mean?

　　A．Lead to

　　B．Take over

　　C．Consist of

　　D．Wipe out

　　6．It is implied in Paragraph 2 that________．ntries will kill dogs with rabies.

　　C．Fewer people will like raising dogs as their pets.

　　D．Vaccinating dogs means fewer people with rabies.

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