Unit 4 Journey Across a Vast Land同步练习 （答题时间：40分钟） 一、阅读理解 Many of us don’t pay much attention to the importance of eye care. It is said that if you take care of your body, then you can surely be healthy. That is why our eyes should be given a lot of care. Natural eye care should be put in a number one place. There are several causes leading to poor eyesight like not enough food, genes (基因) and aging (老化). Televisions, computers and reading are also the causes of having poor eyesight. If you happen to work in front of the computer, it is best to take a break every once in a while. Something dirty can cause redness and it will make you feel uncomfortable. It is bad for your eyes. too. If this happens, the best way is to clean your eyes by using cold water. You must also try your best to protect your eyes from harmful things. For example, sunglasses arc not just for fashion but they can also serve as a great way to protect your eyesight from UV rays. Eating healthy foods will do good to your eyesight. Remember that vitamins A, C and E are good for eyes. Try to cat food groups that have these vitamins. And you should do eye exercises because exercise protects your eyesight, too. If a person exercises regularly and cats the right kind of food, his eves will stay in good condition for a long time. All above arc natural ways of eye care that help us keep healthy eyes. Being happy all the time can be helpful to a person’s eyesight, too. In a word, eye care is very important, no matter how old a person is. 1._____ is the most important way to protect our eyes. A. Natural eye care B. Taking medicine C. Seeing the doctor D. Being happy all the time 2. All the following causes can lead to bad eyesight except _____. A. age B. weight C. reading D. computers 3. What should you do if you have to work in front of the computer? A. Eat healthy foods. B. Clean the eyes by using cold water. C. Wear a pair of sunglasses. D. Have a rest after working for a while. 4. What do the underlined words “UV rays” mean? A. 沙尘 B. 闪电 C. 紫外线 D. 超声波 *5. Which is the best title of the passage? A. Ways of Eye Care B. Ways of Eye Exercise’s C. Ways of Being Happy D. Ways of Being Healthy 二、语法填空 We are concerned about global warming, but how did 1. _____ global warming come about? Scientists believe that “greenhouse effect” begins when we add huge quantities of extra carbon dioxide into the atmosphere by *2. _____（burn） fuels. The increased amount of carbon dioxide *3. _____（cause） the global temperature to go up. Believe it or not, so long as you live on the earth you will suffer 4. _____ the global warming, even if you did not result in it. It is so widespread 5. _____ nobody can avoid it. Fortunately, there are 6. _____（quantity） of things we can do. We can plant more trees, decrease the use of fossil fuels, ride bicycles and so on. In recent years, big companies 7. _____（tend） to use high technology. Government offices are opposed ... ...
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