题目

下列哪种生物变异的现象属于可遗传变异                         （     ） A、白净的皮肤常在太阳下工作被晒成黑色         B、肥胖的人经过锻炼后变瘦 C、暗处理的天竺葵叶子变成了黄色 D、化学药剂处理甜菜幼苗是细胞内的染色体数目加倍 答案：DThe matter _______people’s health surely requires ______ carefully.A．related to ; dealing withB．related to ; dealt withC．relating to ; being dealt withD．relating to ; having dealt with