题目

Researchers are placing robotic dogs（机器狗）in the homes of lonely old people to determine whether they can improve the quality of life for humans. Alan Beck, an expert in human-animal relationship, and Nancy Edwards, a professor of nursing, are leading the animal-assisted study concerning the influence of robotic dogs on old people’s depression, physical activity, and life satisfaction. “No one will argue that an older person is better off being more active, challenged, or stimulated（刺激）,” Edwards points out. “The problem is how we promote（使…成为现实）某哺乳动物细胞分裂的部分图如下。相关叙述中，正确的是A．乙细胞中含有二个染色体组、10个染色单体B．由丙细胞可知该细胞分裂过程中发生了基因突变C．丙细胞继续分裂产生的卵细胞基因型是ABXD或AbXD或aBXD或abXDD．甲细胞经乙细胞后最终产生的子细胞的基因型为AaBbXDXD