【单选题】When we see well, we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are. People who are nearsighted can only see things that are...
【简答题】When we can see well, we do not think about our eyes often: It is only when we cannot see perfectly that we come to see how important our eyes are. People who are nearsighted(近视的) can only see things ...