问答题
A. They are suitable only on broad roads. B. They are falling out of use in the United States. C. They are ignored in a long period of time. D. They cannot be used successfully to traffic circles.
A. People are paying more attention to their own health. B. People are well off enough to pay their health care. C. The NHS was not available for most of the people. D. It’ s not so convenient for people to go to the NHS for their health care.