通读下面短文，掌握其大意，然后在各题所给的四个选项中，选出一个最佳答案。More and more Americans are going to work by bike. Do you know why more people are 1 bikes to work? We can answer the question in 2 ways. First, bikes don't need gasoline(汽油), so it takes less 3 to use them. Second, a bike doesn't 4 much space(空间), so it is 5 to find a place for it. And riding a bike is good for one's 6 . People often drive their 7 to offices or to shops, but now people think riding bikes is a good way of doing sports.
That's 8 more Americans are now going to work 9 bike, and they are 10 their own cars at home.
