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  3. We all know whether we are left-handed or right-handed; hardly any of us know whether we are left-faced. Yet according to Profes

We all know whether we are left-handed or right-handed; hardly any of us know whether we are left-faced. Yet according to Profes

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问题     We all know whether we are left-handed or right-handed; hardly any of us know whether we are left-faced. Yet according to Professor Karl Smith of the University of Wisconsin we are all almost【B1】______one or the other. Right-faced people are more【B2】______than left-faced people, and there is a striking【B3】______between left-facedness and musical talent. Beethoven was left-faced.【B4】______were Brahms, Schubert, Wagner, Tchaikovsky and the【B5】______of other well-known living performers of all kinds of music.
    The idea of facedness【B6】______from many years of computerized study of people’s lip, tongue and jaw movement【B7】______they were talking. Smith and his colleagues found that in most people one side of the face was more【B8】______than the other. There are other【B9】______of facedness, some of which can be【B10】______in static pictures; in right-faced people the right-side of the face is【B11】______compressed between jaw and brow; the right eyebrow tends to be higher; dimples and wrinkles are less【B12】______than on the left.
    From a study of more than 500 people Smith found that the【B13】______of right-faced people【B14】______about nine in ten among Americans to two in three among Acapulco Mexicans. The fact that【B15】______twins were always both right-faced or left-faced suggests a【B16】______origin for facedness.
    Those talented musical artists—"singers and instrumentalists who perform classical, operatic, country and jazz music are almost without exception left-faced." Smith’s findings【B17】______with theories that the right hemisphere of the brain(which controls the left side of the face)is【B18】______for musical performance, the left hemisphere for【B19】______. The idea of facedness, he says, "suggests new【B20】______to the study of all aspects of cerebral dominance and its relation to handedness and speech disabilities".
【B7】
选项 A、as
B、before
C、while
D、since
答案C
解析 考查关联词。要研究嘴唇、舌头以及上下颚的运动．就必须在人们讲话的时候，因此答案为C项。
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