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【单选题】
关于基因、DNA和染色体，下列叙述错误的是A.
DNA是生物的主要遗传物质
B.
染色体是由DNA和蛋白质组成
C.
基因位于染色体上
D.
基因是DNA分子的任意片段
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【多选题】What were taught in grammar school?
A.
rote learning of grammar rules
B.
study of declensions and conjugations
C.
translation
D.
practice in writing sample sentences
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