第5题: [单项选择]粒系早幼阶段的主要标志是() A. 胞体直径大 B. 核大偏位,染色质较细致 C. 可见核仁 D. 胞质中含多量的非特异性颗粒(A颗粒) E. 胞核圆形或椭圆形,位于中央或偏位 参考答案:D 答案解析:早幼粒细胞中,胞质内出现一些“非特异性颗粒”或A颗粒,形态不一,一般呈圆形或椭圆形,外有界膜包围,内容均质,电子密度较高,颗粒内偶见致密核心。
Why did Ms. Mann go to Argentina three years ago A. She went to see her grandparents. B. She went for pleasure. C. She wrote political reports for the BBC. D. She wrote economic stories for the BBC. 参考答案:C