37

　　straight line. Researchers found that people

　　38 the direction of walking every few seconds. The amount of the winding differed from subject to subject. This suggests that

　　39

　　of us can walk in a strictly straight line. We walk in a winding way mainly because of a slight structural or functional imbalance of our limbs. 40

　　we may start walking in a straight line, several steps afterwards we will have changed the direction.

　　41 helps us to correct the direction of walking and leads us to the target. Your ears also help you walk.After turning around a lot with your eyes closed, you can hardly stand still,

　　42

　　walk straight. It’s all because your ears help you balance. Inside your inner ears there is a structure which contains liquids. On the sides of the organ are many tiny hair-like structures that move around as the liquid

　　43 . When you spin, the liquid inside also spins. The difference is that when you

　　44 , the liquid continues to spin for a while. Dizziness is the 45 of these nerves in your inner ears. When you open your eyes, although your eyesight tells you to walk in a straight line, your brain will

　　46

　　your ears more, thus you walk in a

　　47

　　line.

　　36. A. made

　　B. ordered

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