单项选择题
A. For six months. B. It is readily available. C. For three weeks. D. For two days.
A. reduces road accidents by more than half B. saves lives while driving at a speed up to 30 miles per hour C. reduces the death rate in traffic accident D. saves more than 15,000 lives each year
A. Different kinds of books about dogs. B. Different breeds of dogs. C. Responsibility for seeing that dogs are properly cared for. D. The care and proper selection of dogs for family pets.