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  3. Can you walk a straight line? The question is much more difficult to answer than you think. A recent experiment held in Japan sh

Can you walk a straight line? The question is much more difficult to answer than you think. A recent experiment held in Japan sh

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问题     Can you walk a straight line? The question is much more difficult to answer than you think. A recent experiment held in Japan shows that it is almost (47)______ for people to walk exactly straight for 60 meters. Each man had to wear socks soaked with red ink and walk on white paper fixed (48)______ to the floor. The (49)______ showed that all walked in a winding rather than a straight line. Researchers found that people (50)______ their direction of walking regularly. However, the range differed from subject to subject.
    This suggests that none of us can walk in a (51)______ straight line. Rather, we meander(漫步), mainly due to a slight structural or functional (52)______ of our legs. So steps by the left and right legs of a person are (53)______.
    As a result, although we may start walking in a straight line, several steps afterwards we have changed direction. However, (54)______ 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, (55)______ to say, walk straight. It’s all because your ears are still spinning and can’t help you keep your balance. Your inner ear is a structure containing liquids. When you spin, the liquid inside follows your spinning, but when stop, the liquid continues to spin for a while, the result of which is (56)______. For the moment, although your eyesight tells you to walk in a straight line your brain listens to your spinning ears, thus you don’t walk as what your eyes tell.

               Word Bank:
A.imbalance                 I. probable
B.eyesight                  J. folded
C.similar                   K. sleepy
D.impossible                L. needless
E. strictly                 M. footprints
F. dizziness                N. different
G. flat                     O. slightly
H. readjusted
选项
答案B
解析 根据句子结构判断，该空需填入一个名词作主语，由下文中的Your ears also．．．和该句句意：尽管人走的路线歪歪斜斜，但是 ______ 却帮助我们不断纠正行走的方向，并最终走向目标。可知，此处应选eyesight(视力)。
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