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问题 选择题

一棵小树由小长大，并能开花结果，反映出的生命特征是（　　）

A．对刺激能做出反应

B．能排出体内产生的废物

C．能生长和繁殖

D．能进行呼吸

答案

生物具有一下特征：1、生物的生活需要营养．2、生物能够进行呼吸．3、生物能排出体内产生的废物．4、生物能够对外界刺激作出反应．5、生物能够生长和繁殖．6、除病毒外，生物都是由细胞构成的． 植物开花结果，体现了生物能繁殖； 

故选：C

填空题

根据句意和首字母提示完成单词

1. There is a big tree in front of my house, people often rest in the cool s________ of the tree in summer.

2. Yuan Longping is famous for his h________ rice.

3. He g________ from the Southwest Agricultural University in 1953.

4. Yuan Longping has d________ himself to research.

5. Yuan Longping was h________ with the name “Father of Hybrid Rice”.

6. China now p________ enough rice to feed her people every year.

7. In his s________ time, he often writes some stories.

8. It is just a cold. N________ serious.

9. Now Professor Yuan is working on d________ super hybrid rice.

10. She is a s________ swimming in China.
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单项选择题

下述哪一条是由于关系模式设计不当所引起的问题

A．数据冗余

B．数据被非法读取

C．数据被非法修改

D．发生死锁
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