Eyesight plays a very important role in our daily life. Every waking moment, the eyes are working to see the world around us. Over forty percent of Americans worry about losing eyesight, but it's easy to include steps into our daily life to ensure healthy eyes. Here are five suggestions for a lifetime of healthy eyesight:

    Schedule yearly exams.  Experts advise parents to bring babies 6 to 12 months of age to the doctor for a careful check. The good news is that millions of children now can have yearly eye exams and following treatment, including eyeglasses.

    Protect against UV rays(紫外线). Long­term stay in the sun creates risk to your eyes. No matter what the season is, it's extremely important to wear sunglasses.

    Give your eyes a break. Two­thirds of Americans spend up to seven hours a day using computers or other digital products.  Experts recommend that people practice the 20/20/20 rule: every 20 minutes, take a 20­second break and look at something 20 feet away.

     As part of a healthy diet, eat more fruits and vegetables each day. Vitamins(维生素) C and E help protect eyesight and promote eye health.

    Practice safe wear and care of contact lenses(隐形眼镜). Many Americans use contact lenses to improve their eyesight. While some follow the medical guidance for wearing contact lenses, many are breaking the rules and putting their eyesight at risk.  Otherwise, you may have problems such as red eyes, pain in the eyes, or a more serious condition.

A. Eat your greens.

B. Eye care should begin early in life.

C. They can properly protect your eyes.

D. Stay in good shape by taking more Vitamins.

E. Parents usually don't care about their own eyesight.

F. Always follow the doctor's advice for appropriate wear.

G. This frequent eye activity increases the risk for eye tiredness.

    Yosemite is a national park in California. It is very beautiful and big. The park includes more than 760,000 acres (英亩) in the California Mountains. Most of the park is wild (荒凉的).

    The part of Yosemite that everyone likes is Yosemite Valley. It is a small valley that is 7 miles long and less than 1 mile wide. It has tall rock walls and streams that flow down in waterfalls. More than two million visitors come to the valley each year.

    It's said that the number of visitors is more than the land can hold. The valley has 4,500 camping places. It has a hotel that can hold 4,000 families. This is still not enough to serve all of the visitors. The valley has grown so big that it has a lot of traffic.

    A worker says the park is trying to keep the beauty of the park and let everyone visit. Some areas have been rounded up (圈起来) to keep people away and planted with seeds to try to keep them beautiful.

    A former worker thinks Yosemite should get more money to take better care of the park. He would also like to teach people what the park service is trying to do.

    Some people are trying to save Yosemite Valley. A plan has been made to remove some buildings. There will be fewer cars allowed inside the park. More buses will help get people around.