14.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(帶子) 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 10kilograms,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 10to 15percent of their own body weight.
A few students had one suggestion to lighten the load:less homework.
P.S.(附) Doctor's suggestions:
●Lighten the load.Clean out binders(活頁材料) and take home only the books you need that night.
●Wide straps are better.They send out the weight over your shoulders more evenly(均勻).And be sure to wear both straps rather than hanging the pack over one shoulder.
●Pack smart.The heavier things should be packed closed to the back.
●Bend both knees when you pick up the pack,and don't just bend over at the waist(腰).
79.The expression"switched to"in the text perhaps meansA.
A.started to use
B.turned to
C.caught up
D.used for.

分析 這篇短文主要描述了中美學(xué)生的書包都很重,這會(huì)對學(xué)生的身體造成不良影響.專家對此提出了建議,并號(hào)召老師和家長采取適當(dāng)?shù)拇胧?/p>

解答 答案:79.A 詞義猜測題.根據(jù)上下文but a number of students with heavy loads had switched to rolling backpacks (which have wheels and can roll on the ground).但是一些重負(fù)荷的學(xué)生已經(jīng)改用滾動(dòng)的背包(有輪子和可以在地上滾動(dòng)).可知有輪子和可以在地上滾動(dòng),結(jié)合選項(xiàng),應(yīng)說但是一些重負(fù)荷的學(xué)生已經(jīng)改用滾動(dòng)的背包.所以此處switched to 指的是許多學(xué)生開始使用滾動(dòng)背包.故選A.

點(diǎn)評 在通讀全文的基礎(chǔ)上,根據(jù)全文大意,展開邏輯思維,瞻前顧后,認(rèn)真觀察選項(xiàng),仔細(xì)推敲,確定最佳答案.

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