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  3. Recent studies of the human brain have resulted in some interesting discoveries. Scientists believe that a way to improve the po

Recent studies of the human brain have resulted in some interesting discoveries. Scientists believe that a way to improve the po

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问题     Recent studies of the human brain have resulted in some interesting discoveries. Scientists believe that a way to improve the power of the brain may soon be possible.
    Scientists have discovered that the brain can make its own drugs. The brain【C1】________ a protein substance which can act directly【C2】________ the brain to change aspects of mental activity. Some may change or improve, for example, creativity, intelligence, imagination, and good【C3】________ .
    Chemicals found in the brain【C4】________ messages. In recent years scientists have found chemicals that【C5】________ mood, memory and other happenings of the mind. About 25 have been found【C6】________ .
    Today the role of chemicals and the protein substance in human behavior is creating much interest. Research seems to show that they may help【C7】________ insomnia, pain, and mental illness. They have a great【C8】________ to stimulate the brain to【C9】________ deficiencies. They also improve the qualities of memory and learning already in the brain. They【C10】________ the secret on mood and emotion. Some day there may be a chemical way to create a better and more efficient brain.
【C2】
选项 A、against
B、on
C、for
D、to
答案B
解析 act on固定搭配，表示“对……起作用”。
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