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问题 选择题

关于人体衰老细胞和癌细胞的叙述，正确的是[ ]

A．癌细胞与衰老细胞都有基因表达

B．癌变和衰老都是细胞的正常生命现象

C．癌细胞和衰老细胞都会正常凋亡

D．衰老细胞和癌细胞都能正常分化

答案

答案：A

写作题

裉据下面所给词语写一篇短文。

I, want, visit, Qingdao, for a long time

I, go, there, parents, last summer, on vacation

it, modern city, with, tall buildings

first, go, zoo, next, beautiful  beach

after that, go to the aquarium, watch, dolphin show

hang out, parents, buy a souvenir, gift shop

people,  friendly,  want, go, again  

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问答题 简答题

简述开发和利用地下空间的意义。
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