完形填空 阅读短文，从每题所给选项中选出可以填入空白处的最佳选（10分） More and more Americans are going to work by bike. Do you know why more people are bikes to work? We can answer the question in ways. First, bikes don’t need gasoline (汽油), so it takes money to use them. Second, a bike doesn’tmuch space (空间), so it isto find a place for it. And riding a bike is good for one’s. People often drive their _____to offices or to shops, but now people think riding bikes is a good way of doing sports. That’smore Americans are now going to work bike, and they are their own cars at home.