2017-02-28 00:17 来源：小牛英语
We humans are only born with one set of eyes, so it's our job to take care of them for our whole lives. The good news is that if we do a few simple things every day, we can maintain (保持) our eyesight and reduce (减少) the risk of ever hurting our eyes.
Almost all doctors agree that we can improve and maintain good eyesight by eating lots of fresh fruits and vegetables. It is especially important for us to eat vegetables like carrots and sweet potatoes. Besides, we need to protect our eyes when we spend a long time in bright sunlight. The best way to do this is by wearing sunglasses that have 100% UV (紫外线) protection. What's more, it is necessary to protect our eyes when we work with dangerous chemicals (化学物质). For this reason we should always wear goggles in chemistry labs at work or at school. Finally, we should not spend too much time in front of the computer or television screen. That is why doctors advise if we have to use a computer for a long time, we should take a short break every fifteen or thirty minutes.
Maintaining good eyesight is important. If we do these few simple things we can protect our eyes and reduce the chances of losing our eyes. As the popular English expression goes, "It's all fun and game, until someone loses an eye." When people say this, they mean that losing an eye is a very terrible thing.
How many pieces of advice are given in the passage?
细节题。 由第二段第一句 Almost all doctors...by eating lots of fresh fruits and vegetables 第三句 Besides, we need to protect our eyes when we spend a long time in bright sunlight 第五句 What's more, it is necessary to protect our eyes when we work with dangerous chemicals 和倒数第二句 Finally, we should not spend too much time in front of the computer or television screen 可知，文章给了四种建议，分别是多吃新鲜蔬果、长时间处于日光下时需要护眼、当工作涉及化学物质时需要护眼、不要看太长时间的电脑或电视。 故正确答案为C。