第28题: [单项选择]在个体发育中,由一个或一种细胞增殖产生的后代在形态、结构和生理功能上发生稳定性差异的过程叫做() A. 细胞分化 B. 细胞分裂 C. 细胞衰老 D. 细胞癌变 参考答案:A 答案解析:在个体发育中,由一个或一种细胞增殖产生的后代在形态、结构和生理功能上发生稳定性差异的过程叫做细胞分化。故选A
考点:本题考查细胞分化的概念。
点评:本题意在考查考生的识记能力,属于容易题。
第36题: [单项选择]______ is the center of our planetary system was a difficult concept to grasp in the Middle Age. A. It is the sun and not the earth B. Being the sun and not the earth C. The sun and not the earth D. That the sun and not the earth 参考答案:D 答案解析:根据句子结构我们可以看出,在was前面是一个主语从句,而主语从句必须有引导词,但A,B,和C中都没有引导词,因此三个均错。D中that引导主语从句,在句中不做任何成分,只起引导词的作用,因而D是正确答
第37题: [单项选择]Questions 22 to 25 are based on the conversation you have just heard.A) In a concert hall. C) At an exhibition. B) In the National Palace Museum. D) On the plane. 参考答案:B 答案解析:[听力原文]22-25 M: Here we are. This is the National Palace Museum. What are you especially intereste