1. (2021·重庆) 根据你所听到的短文内容，从A、B、C三个选项中选出正确答案。

1. （1） In the program, Dr. Smith mainly talks about how to             .

   A . use our eyes B . protect our eyes C . check our eyes
3. （2） When watching the screen, we should stop to look at something far away            .

   A . every 20 minutes B . every 30 minutes C . every 40 minutes
5. （3） Every two years, it's important to            .

   A . get an eye examination B . change a pair of glasses C . listen to the program
7. （4） If the doctors notice our problems earlier, I'll be            .

   A . necessary to wear sunglasses B . easier to correct the problems C . difficult to keep eyes healthy