单项选择题
A．are more convenient than cars B．are safer traffic tools than cars C．are ridden by most people in U.S. D．are the solution to some city problems
A．Washington's lack of formal education placed him at a disadvantage in later life B．Washington should have gone to France even though be could not speak French C．Washington was not as good as a president as Adams, Jefferson or Madison D．Washington was a model for all Virginian gentlemen
A．narrow passages in between buildings for bicycles B．roads full of bicycles C．special parts of the road for bicycle riders only D．roads for bicycles only