正确答案: BC

染色质 染色体

题目：细胞核结构中，经过适当溶剂处理后，容易被碱性染料染色的部位( )。

解析：BC

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[单选题]Doctors say that exercise is important for health, but it be regular exercise .

must

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a way of buying and selling goods

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洋葱的鳞叶和仙人掌的刺

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shelter