7．Many people hurt their backs when they try to lift heavy things from the floor．It is easy to hurt your back muscles when you pick up a heavy object．However，there is a correct way to lift things from the floor if you pick up or lift heavy objects correctly，you probably will not hurt your back．
To lift something from the floor correctly，first bend your knees and squatdown．Keep your back straight．Do not bend over from your waist； keep your back and hips and waist in a line．If you bend over，the muscles in your lower back can become wounded very easily．If you keep your back and hips stronger，they have much more support．The other muscles can then help the lower back muscles．
As you squat down，try to get as close to the object as possible．For example，if you are going to pick up a heavy box，squat down directly in front of it．Maybe you will have to spread your knees and legs．Put one knee on each side of the box．Remember at all times to keep your back straight．
Put your hands under the objects that is in front of you，between your knees．
To lift objects，you should stand up slowly．Use your leg muscles in order to stand up．In other words，lift with your legs，not with your back．

16．If you try to lift heavy things from the floor，B．
A．you will hurt your back                  B．you may hurt your back
C．you must hurt your back                  D．you never hurt your back
17．According to the passage，how can you avoid hurting yourself while lifting things from the floor？C
A．To get yourself insured．
B．Never to lift heavy things．
C．To use the correct way to lift things．
D．To do body exercises to have more strength．
18 To lift a heavy object mainly depends on yourA．
A．legs          B．back         C．knees         D．hands
19．To lift a heavy box，the most important thing you should do isD
A．to put your hands under the box       B．to bend your knees and squat down
C．to put one knee on each side of it    D．to keep your back straight at all times
20．When you lift a heavy thing，which of the following is NOT true？B
A．Keeping your back and hips and waist in a line．
B．Putting one knee in front of the thing．
C．Standing up slowly．
D．Putting your hands under the thing between your knees．
21．What does the underlined word"squat"mean in the passage？B
A．站            B．蹲            C．爬             D．糖．

分析 本文是一篇科教類閱讀，許多人從地上搬重物時會傷到背部，當(dāng)你拿起沉重的物品時，很容易傷到背部肌肉，然而，有一個正確的方法，可以將東西吊從地板上如果你選擇正確或抬重物，可能不會傷害你的背部．本文以此展開，主要描述了一些人之所以總是弄傷背部的原因，并對此提出了幾點詳細的建議．

解答 16．答案：B．細節(jié)理解題．根據(jù)"It is easy to hurt your back muscles when you pick up a heavy object．"可知，當(dāng)你拿起沉重的物品時，很容易傷到背部肌肉、故應(yīng)該是可能會傷到背部肌肉．故選B．
17．答案：C．細節(jié)理解題．根據(jù)"However，there is a correct way to lift things from the floor if you pick up or lift heavy objects correctly，you probably will not hurt your back．"可知，你使用正確的方式去抬重物，可能不會傷到背部．故選C．
18．答案：A．細節(jié)理解題．根據(jù)"In other words，lift with your legs，not with your back．"可知，抬東西用胳膊．故選A．
19．答案：D．細節(jié)理解題．根據(jù)"Remember at all times to keep your back straight．"可知，抬東西時應(yīng)保持背部挺直．故選D．
20．答案：B．細節(jié)理解題．根據(jù)"Put one knee on each side of the box．"可知，把膝蓋放在盒子的兩側(cè)，而不是把膝蓋放在盒子前．故選 B．
21．答案：B．詞義猜測題．根據(jù)"As you squat down，try to get as close to the object as possible．"可推測出，句意為當(dāng)你蹲下時，嘗試盡可能靠重物近．故squat意為蹲．故選B．

點評 本文是一篇科教類閱讀，題目涉及詞義猜測題，細節(jié)理解題．做題時學(xué)生應(yīng)仔細閱讀原文，把握文章主要內(nèi)容，聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項含義，從中選出正確答案，一定要做到有理有據(jù)，切忌胡亂猜測．

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