Many people hurt their backs when they try to lift heavy things from the floor. It is easy

Many people hurt their backs when they try to lift heavy things from the floor. It is easy to hurt your back muscle(肌肉) when you try to pick up a heavy thing. However, there is a correct way to lift things from the floor. If you pick up heavy things correctly, you probably will not hurt your back.
To lift something from the floor correctly, first bend (弯曲) your knees and lower yourself. Keep your back straight. Do not bent over, from your waist (腰) keep your back and hips (臀部) and waist in a line. If you bent over, the muscles in your lower back can became hurt very easily. If you keep your back and hips straight, the muscles are stronger, because they hold up together. The other muscles can then help the lower back muscles.
As you lower yourself, try to get as close to thing as you can, put one knee on each side of the thing. Remember at all times to keep your back straight. Put your hand under the thing that is in front of you, between y our knees.
To lift the thing, 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.
【小题1】Which part of your body is more easily to be hurt when you lift heavy things?A．The leg muscles.B．The back musclesC．The hipsD．The knees【小题2】Many people hurt their backs when they lift something because     .A．they are not strongB．the things are very heavyC．the way to lift the things is not correctD．they are very heavy【小题3】The muscles are stronger if you     .A．keep your back, hips and waist in a lineB．bend over from your waistC．lower yourselfD．get down on your knees【小题4】To lift heavy things, the most important of all is to     .A．stand up slowlyB．keep your back straightC．bend your kneesD．put one knee on each side【小题5】What does “In other words” mean?     A．总而言之B．换句话说C．在其它话中D．在其它单词中Ｂ