下列关于人和动物细胞的叙述,正确的一组是 ①霜冻导致香蕉植株死亡不属于细胞凋亡现

题型:选择题

问题:

下列关于人和动物细胞的叙述,正确的一组是

①霜冻导致香蕉植株死亡不属于细胞凋亡现象  ②由胚胎中胚层细胞分化成红细胞的过程是可逆的 ③细胞内水分减少,代谢速率减慢是衰老细胞的主要特征之一 ④癌变是细胞原癌基因和抑癌基因发生突变的过程 ⑤动物细胞膜表面的糖蛋白具有特异性,是细胞间相互识别、联系用的语言或文字 ⑥癌细胞容易在体内转移与其细胞膜上糖蛋白等物质减少有关[ ]

A.①③⑤⑥

B.①②③⑤⑥

C.①②④⑤

D.②③④⑥

考点:细胞的癌变细胞膜的功能细胞的分化细胞凋亡与细胞坏死
题型:选择题

阅读理解。请根据短文内容选择最佳答案。

      My name is Bill. I'm from the USA. My Chinese teacher is Wang Mei. She is a good teacher. I have many

friends at school. Jimmy is my best friend. He's from Canada. He's tall and he has black hair. Mary is a short

girl. She likes elephant. Sandra is from England. She has long brown hair. She likes monkeys. Wang Dong is

from China. He has short black hair. He speaks English well.

1. Wang Mei is Bill's _____________.

A. teacher

B. friend

C. mother

2. _____________ is from Canada.

A. Wang Dong

B. Jimmy

C. Sandra

3. _____________ has brown hair and likes monkeys.

A. Mary

B. Sandra

C. Jimmy

4. Wang Dong is good at (擅长于) _____________.

A. English

B. painting

C. Chinese

5. How many friends does Bill have?

A. Three.

B. Four.

C. Five.

题型:选择题

All   is needed is a supply of oil.

A.the thing

B.that

C.what

D.which

题型:选择题

(5分)(1)现有下列6种物质,选择相应物质的字母填空。

A.石墨

B.小苏打

C.氧气

D.氢气E.熟石灰       F.聚乙烯塑料     G.尿素       H.葡萄糖

     是电解水时负极端产生的气体     

     可用于制轻轨电刷

     可用于治疗胃酸过多          

     可能支持可燃物的燃烧

     可用于改良酸性土壤

题型:选择题

正常肥胖人的心影呈()

A.梨形心

B.靴形心

C.主动脉型心脏

D.横位心

E.悬滴状心

题型:选择题

在国际收支平衡表中,若储备资产是负号,则表示()。

A.储备资产减少

B.储备资产未变化

C.储备资产增加

D.储备资产赤字

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