A. they can eat its parasites B. they enjoy traveling with the sheep C. they depend on the sheep for existence D. they find the position most comfortable 参考答案:A 答案解析:[解析] 事实细节题。从文章第一段第四句,This is not because they want a ride,but because they find easy food in the par
第23题: [单项选择]男性,62岁,前列腺肿物,病理切检诊断小细胞性神经内分泌癌。病理诊断的形态学依据是() A. 不规则小圆细胞巢形态一致,外周为栅状排列的上皮细胞 B. 移形细胞癌的形态学特点 C. 小圆细胞组成不规则条索,细胞形态一致,间质淀粉样物质沉着 D. 弥漫性分布的小蓝细胞,形态不规则,核深染,核分裂多 E. 小圆细胞呈筛状排列,间质侵犯 参考答案:D 答案解析: