下列哪项不是哺乳动物衰老的红细胞所具有的特征( ) A.水分减少,细胞萎缩 B.某些酶的活性降低 C.细胞核体积减小 D.细胞膜的通透性功能改变 答案:解:A、细胞衰老后,水分减少,细胞萎缩,A正确; B、细胞衰老后,某些酶的活性降低,B正确; C、哺乳动物衰老的红细胞内无细胞核,C错误; D、细胞衰老后,膜的通透性功能改变,物质运输功能降低,D正确. 故选:C.We’re
going to the bookstore in John’s car. You can come with us you can
meet us there later.
A. but
B. and
C. or
D. then