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单项选择题

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A.Training given to music therapists.
B.How music prevents disease.
C.Studies on the benefits of music.
D.How musicians create music.
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单项选择题A.They made them by knives.B.They found adequate stones.C.They used bones of animals.D.They made tools by hitting stone against stone,

A.They made them by knives.
B.They found adequate stones.
C.They used bones of animals.
D.They made tools by hitting stone against stone,

单项选择题A.Because the fibers of his muscles are very thick.B.Because he has more muscles.C.Because his muscles are made of more stringy fibers.D.Because the number of his muscles was fixed during his childhood.

A.Because the fibers of his muscles are very thick.
B.Because he has more muscles.
C.Because his muscles are made of more stringy fibers.
D.Because the number of his muscles was fixed during his childhood.