任务型阅读。（每小题2分，共8分）
阅读下文并回答问题。
National Eye Care Day on June 6th is a good chance for us to improve our eye health . What are common eye problems we have today ? How can we protect our eyes ? Read on to find out the answer .
Eyes are important in our everyday life . We use them to read books , see colors and view the wonders of the world . But sometimes , we use them too much and it hurts them .
In the past , nearsightedness（近视）was a common eye problem among children . This is mostly because of their bad eye habits , such as watching TV too long and reading books in bed .
However , today’s technology is changing the way we live . Children spend more time working and playing in front of computers , smart phones and iPads . US children spend more than 42 hours a week in front of electronic screens（电子屏幕）, US’ABC news reported .
This has caused a new problem for our eyes : digital（数字的）eyestrain（眼疲劳）. People with digital eyestrain may get headaches , dry and red eyes , eye pain , watering and other eye problems .
But don’t worry . The following tips can help you protect your eyes . Try them out .
Screen advice :
1. When you are watching electronic screens , keep them at least 30 cm from your eyes . Try not to use your smart phone in direct sunlight .
2. Blink（眨眼）more often when you are looking at the screen . This can help to stop dry eyes .
3. Remember to take a 20-20-20 break : every 20 minutes , take a 20-second break and look at something 20 feet ( about 6 meters ) away .
4. Spend less time in front of screens . One to two hours a day is OK for your eyes .
Do people get a good chance to care about their eye health on June 6^th every year ?
____________________________________________________________________________
When is National Eye Care Day ?
____________________________________________________________________________
Why was nearsightedness a common eye problem among children in the past ?
____________________________________________________________________________
How many times had you better take a break if you need to watch the electronic screens for one hour ?
____________________________________________________________________________