The phenomenon is not just limited to US；it's a global problem. J ulie Smith once studied three endan- gered species in central Asia~ wild sheep, gazelles and antelope. The rate of injury and death to these ani- mals by loose dogs was very high. In another case, Smith found that dogs, not wolves, as originally sus- pected, were responsible for a large number of livestock killings in the mountainous Basque country be- tween Spain and France.

　　Authors of the new study said the problem is likely to worsen as communities expand. Then how to deal with it?

　　Indeed, in many countries, leash(拴狗的皮带) laws permit punishment of dog owners whose pets at- tack wildlife. But lawbreakers are ~arely punished because the police lack both people and money.

　　Smith has low-cost solutions to the problem for dog lovers, though. They include public dog-training programs and vaccinating (预防接种) dogs against rabies and other illnesses.

　　68. Julie Smith's study mainly tells us that

　　A. many species are endangered because they are killed by loose dogs.

　　B. wild dogs are immune to many diseases.

　　C. wolves are still the greatest enemy of livestock.

　　D. loose dogs are a great danger to wildlife.

　　69. Which of the following statements about loose dogs is TRUE according to the research?

　　A. There are around 500 million loose dogs around the world.

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