4．【答案】D

　　【解析】细节理解题。 从第三段最后一句“Looking on the bright side, it seems, can add years to your life span.”可推知答案为D。

　　Ⅲ.七选五阅读

　　(湖南浏阳高三上学期期中三校联考)

　　Is your back bothering you, and are you wondering how to get rid of your back pain? If the phrase “Ouch, my back！” is a regular part of your life, you're not alone: 65 million Americans suffer from back pain.__1__

　　1．Stand Better

　　Standing for long periods can be stressful on your lower back.If you have to stand for work, try placing one foot on a stool or other low objects.__2__ This will help take the pressure off your lower back.Wearing cushioned shoes or standing on a thick rubber mat can also help relieve pressure when you have to stand for long hours.

　　2．Start to Exercise Gradually

　　__3__ But if you've been inactive for a while, start slowly.Begin with a low­impact exercise such as walking, stationary biking, or swimming for about 30 minutes a day.Adding gentle stretching or yoga may also help your muscles.

　　3．Sit Comfortably

　　If your job requires you to sit for long periods, make sure your chair has a straight back, an adjustable seat, and armrests.__4__If you need extra support, place a rolled towel behind the lower part of your back.Resting your feet on a low stool can also help ease back pain when sitting.

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