阅读理解

　　Are you carrying too much on your back at school? You’re not alone．Back experts in the United States are worried that young students are having back and neck problems as a result of carrying too much in their backpacks(schoolbags)．

　　“It hurts my back when I run,” said Oberlin Reyes, a student in Virginia．“It’s hard to get up the stairs with my backpack, because it’s too heavy．”

　　Oberlin is among students whose backpacks were weighed for a week in a recent study．

　　They had regular backpacks with two straps(带子)to carry them, but a number of students with heavy loads had switched to rolling backpacks(which have wheels and can roll on the ground)．

　　Shirley Park, whose backpack weighed 10 kilograms, said she changed to a rolling backpack because she was starting to have back pain．

　　How much is too much? Experts say students should carry no more than 10 to 15 percent of their own body weight．

　　A few students had one suggestion to lighten the load：less homework．

　　P．S．(附)Doctor’s suggestion：

　　① Lighten the load．Clean out binders(活页材料)and take home only the books you need that night．

　　② Wide straps are better．They send out the weight over your shoulders more evenly(均匀)．And be sure to wear both straps rather than hanging the pack over one shoulder．

　　③ Pack smart．The heavier things should be packed closed to the back．

　　④ Bend both knees when you pick up the pack, and don’t just bend over at the waist(腰)．

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阅读理解

　　Can you imagine spacemen's everyday life in space? They also need to eat, sleep, exercise and relax．They do the same things as us, but they do them differently．

　　On Earth, we put food on a plate．Gravity(重力)holds the food down and keeps it on a place．But there is almost no gravity in space, so food can float away, and spacemen must eat carefully．

　　Sleeping is very different in space．Some spacemen like to float(漂浮)in the air, but most like to be in a sleeping bag．They tie the bag to a wall so that they won't float away at night．

　　Exercise is very important in space．On Earth, your legs carry your body, but in space, spacemen float, so they do not use their legs often．This is very bad for their legs, so they must exercise for thirty minutes every day．

　　After a day's work, spacemen relax．They may listen to music, read, watch films, play games, or　talk to their friends and families on the radio．Sometimes they just enjoy floating in the air．

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