题干

下列关于细胞癌变的叙述,错误的是(  )

A:癌细胞的细胞膜糖蛋白含量减少,导致其易扩散、易转移

B:细胞癌变后,其形态结构发生明显的变化且具有无限增殖特点

C:原癌基因的主要功能是阻止细胞发生异常增殖

D:紫外线、抽烟和病毒感染均可诱发正常细胞癌变

上一题 下一题 0.0难度 选择题 更新时间:2018-01-18 07:26:05

答案(点此获取答案解析)

C

同类题5

还原句子。根据材料内容,从方框中选择恰当的句子填入文中空缺处,使短文意思通顺、内容完整。   

    TFK Kid Reporter Dahlia Suiter spoke with the writer of Writer to Writer: From Think to Ink.

    You just said that you didn't think you'd become a writer. Why?

    I didn't know what I would be. There were times when I wanted to be a scientist. I loved reading about biology.

    ①____

    I never thought about writing stories for adults (成年人). It was always for children because when I was a child, books were so important to me.

    ②____

    Revision(修改) is my favorite part. If I can add (增加) something surprising at the same time, I'm happy about that, too.

    ③____

    Writing is hard, and if you're not having fun with it, why do it? "Save ( 保存) what you write" is very important because you may need it. You may need that part you cut.

    ④____

    I hope the book will open up new places to go with writing.

    ⑤____

    Yes. Writing can be a good way to discover (发现) yourself. You learn about yourself when you write. Writing also slows your thinking down, and you can make discoveries and go places that you don't expect.

A. Do you think it's very important for kids to practice writing?

B. What do you hope kids will learn from Writer to Writer?

C. Why did you write "Have fun, and save what you write!" at the end of each part in Writer to Writer?

D. What do you enjoy most about writing?

E. Why do you write children's books?