Whether a person is right-handed or left-handed results from________.

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问题 Whether a person is right-handed or left-handed results from________.
  
Some people are right-handed and some are left-handed. No one knows the reason why a person becomes right-handed or left-handed. (11) It is not true that it is caused by the way in which his parents educate him. In other words, a person is born to be right-handed or left-handed. Moreover, the left-handed and the right-handed "think" differently. Having to use the hand you’re not used to can be very upsetting.
    One day I tried an experiment: changing hands while eating rice with chopsticks. Being a right-hander, I hoped it would not be too hard for me to take the food with my left hand. Soon after I started, I realized I didn’t know what I was doing. (12)So I moved in front of a big mirror, in order that I could observe my actions clearly. (13) Looking at myself in the mirror, I found I looked like a man who had never used chopsticks. I grew more and more nervous and finally I had to give it up.
    My experience shows, being forced to use the hand one is not used to affects a person’s mind. So we should not try to change a left-hander to a right-hander. Some people still think being left-handed is bad, but luckily this idea is changing.

选项 A、To enable the speaker to dress himself up in the experiment.
B、To enable the speaker to record his play in the experiment.
C、To enable the speaker to get more lights in the experiment.
D、To enable the speaker to watch his actions in the experiment.

答案D

解析 细节题。作者表示,实验一开始,由于看不到自己在做什么,所以就对着一面镜子,以便自己观察得仔细。D为正确选项。
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