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下列关于细胞凋亡的说法不正确的是[ ]

A．细胞凋亡受到严格的由遗传机制决定的程序性调控

B．细胞凋亡对于多细胞生物抵御外界各种因素的干扰起着非常关键的作用

C．骨折时造成的骨细胞死亡也可称为细胞凋亡

D．细胞的自然更新，被病原体感染的细胞的清除也是通过细胞凋亡完成的

答案

答案：C

完形填空

I  have a good friend． 1  name is Peter．We study in Beijing Sunshine Secondary Schoo1．We are in the same(同一个)class．He sits in front of  2  ．His favourite lesson is Music．He   3  many CDs．He likes  4   music very much．He likes playing football，t00．After school we  often   play  football in the  5   ．He is very helpful．We often help each   6  ．

Peter  is  not a Chinese．He is from   7   ．He comes to Beijing  8    his family．His father is  a doctor and his mother is a nurse．They work from Monday        9    Friday．At weekends，his mother  likes shopping and his father likes fishing．Sometimes they go to the park．They all like Chinese  food．They    lO    very happy．

1．A．He    B．His    C．She

2．A．I    B．my    C．me

3. A．have    B．has    C．there is

4．A．1isten    B．1isten to    c．1istening to

5．A．classroom    B．library    c．playground

6．A．one    B．other    C．others

7．A．England    B．Chinese    C．Eng]ish

8. A. from    B．on    C．with

9．A in    B．to    C．with

10. A．be    B．am    C．are
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隶臣妾
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