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【单选题】
下列关于正常女性体细胞中染色体组成的说法，正确的是
A.
22对常染色体和1个X染色体
B.
22对常染色体和1个Y染色体
C.
22对常染色体和1对X染色体
D.
22条常染色体和1对X染色体
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【单选题】How often does one hear children wishing they were grown up, and old people wishing they were young again? Each age has its pleasures and its pains, and the happiest person is the one who enjoys what ...
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