Exercise your eyes.

　　The only exercise most eyes get is that daily rubbing we give them when we're tired or suffering from eyestrain. But eye exercises are actually good for your eyes and can improve your vision. __4__ Blink as fast as you can for a few seconds then close your eyes tightly, open and repeat. Do this exercise 3 to 4 times daily.

　　Eat healthy.

　　You probably hear that statement all the time but eating the right foods are necessary to good health. __5__ Foods that are high in fiber, vitamin C, D and beta carotene as well as other vitamins and minerals can help improve your vision. Here are a few foods that can be beneficial to good vision: carrots, eggs, blueberries, spinach, kale, grapes, and fresh garlic.

　　A．Reduce eyestrain.

　　B．Keep your eyes moist.

　　C．Sugar is your eye's worst enemy.

　　D．Give your eyes a workout with the following exercise.

　　E．You may not be aware that your diet affects your vision but it does.

　　F．Close eyes and cover them with the palms of your hands.

　　G．Be sure to get plenty of sleep so your eyes don't strain to stay open during the day.

　　本文为说明文，讲述的是如何自然地改善视力问题，并提出一些相应的建议。

　　1．A　从该tip中的内容可知，该段讲述的内容与strain有关，故可知答案。

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