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Sometimes people hurt their backs because they try to lift heavy things. It is easy to hurt back muscle when people try to pick up a heavy thing. 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.

How to lift something from the floor correctly? Firstly, bend your knees and lower yourself. Keep your back straight. Do not bent over and keep your back and hips and waist in a line. If you bent over, the muscles in your lower back can 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.

Secondly, as you lower yourself, you should try to get as close to the thing as possible and 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 your knees.

Lastly, you should stand up slowly. Try to stand up by using your leg muscles.

1.Why do people sometimes hurt their backs?

A Because they try to lift heavy things.

B Because they like doing exercise.

C Because they have no muscle.

D Because they are weak.

解析：选A。细节理解题。根据第一段第一句Sometimes people hurt their backs because they try to lift heavy things.可知有时候，人们会因为试图提起重物而伤到自己的背，故选A。

2.How won’t you hurt yourself?

A Be stronger.

B Do not lift anything.

C Just pick up light things.

D Pick up heavy things correctly.

解析：选D。细节理解题。根据第一段最后一句If you pick up heavy things correctly, you probably will not hurt your back.可知如果你正确地拾起重物，你可能不会伤到你的背，故选D。

3.What’s the most important part of lifting something?

A Keep your back straight.

B Bend your back.

C Bend your arms.

D Use your knee.

解析：选A。细节理解题。根据第三段并结合全文可知最重要的是保持背部挺直，故选A。

4.What’s the third step to lift heavy things?

A Stand up slowly.

B Stand up quickly and walk.

C Stand up by using leg muscles.

D A&C.

解析：选D。细节理解题。根据最后一段Lastly, you should stand up slowly. Try to stand up by using your leg muscles.可知要把东西抬起来，应该慢慢站起来。用你的腿部肌肉站起来，故选D。

5.What’s the main idea of the passage?

A How to be stronger.

B How to have more muscle.

C How to pick up a paper box.

D How to lift something correctly.

解析：选D。主旨大意题。根据全文可知文章主要围绕如何举起正确重物展开，故选D。