To lift something from the floor correctly, first bend your knees and squat down. Keep your back and hips(臀部) and waist (腰部) in a line. If you bend over, the muscles ( ~ I$1 ) in your lower back can become hurt easily. If you keep your back and hips straight, the muscles are stronger, because they have much more support. The other muscles can then help the lower back muscles.

As you squat down, try to get 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 object that is in front of you, between your knees.

To lift the object, you should stand up slowly. Use your muscles in order to stand up. In other words, lift with your legs, not with your back.

1. The underlined word "squat" means________.

A. to bend over your waist B. to bend yourself by bending your legs

C. to lower yourself by bending your legs D. to stand straight

2. You should keep your back straight so that________.

A. the muscles can' t be hurt B. the muscles will have more support

C. you seem to be stranger D. you will get more muscles

3. The correct way to lift something heavy from the floor is________.

A. to bend over from your waist first

B. to bend your knees and squat down first

C. to keep your back in a line

D. to put your hands under the object

4. What lifts the object in fact?

A. The muaelea of your arms. B. The muscles of your back.

C. Your hands. D. Your leg muscles.

Keys: 1-4 CBBD