问题 填空题

请你设计一个实验证明:人体呼出的气体中含有较多的二氧化碳。     

(1)A.你的实验设计方案是:____________________________________________

B.预测的试验结果是____________________________________________

(2)你应如何保持室内空气新鲜? ____________________________________________

答案

(1)取甲乙两只试管洁净的试管,导入等量的澄清石灰水     将玻璃管插入甲试管向甲试管吹气,乙试管不吹气

(2)“略”

完形填空

Maureen stood by the lake. Suddenly the children came running through the trees with sharp cries of ___1___. They rushed up to the ___2___, leaning over the clear water, watching the crowds of tiny fish. Some children demanded loudly to go to the boats, but ___3___ those who had been left behind at the ice-cream stall(小摊) came running up to make some announcement or other, and they all ___4___ the water and dashed back the ___5___ they had come. With growing excitement, Maureen ___6___ them.

When she ___7___ what had been running for, she stopped running. They were ___8___ things again. The toy stall was ___9___ and they were crowded around it. Behind the ___10___ a calm middle-aged woman was selling a great variety of small rubbish. She took ___11___ from the forest of small hands in exchanging for little boats, plastic dolls, yellow pencils, anything. Maureen leaned against a ___12___, looking on. The idea of ___13___ washed against her face like a strong current(流), trying to draw her in.  

Nona Parker pushed out to the edge of the group and ___14___ what she had bought on the ground so that she could see what money she had left in her white purse. Under Maureen’s ___15___ lay a boat, a mouth organ(口琴) and a brown load of bread. Maureen was so full of the ___16___ for the things like that she couldn’t bear to look at it. She turned her ___17___ sharply. Her face was against the tree. She shut her eyes and ___18___ eagerly for some money, for the price of a set toy plates. In a moment, she opened her eyes, ___19___ she didn’t turn back to the stall. It was too ___20___ to see the others buying whatever they wanted. She rubbed almost round the tree, her eyes on the ground.

1. A. fright         B. surprise      C. shout       D. excitement

2. A. space          B. hill         C. lake         D. river

3. A. what’s worse  B. all at once    C. all the time   D. more or less

4. A. left          B. polluted      C. painted     D. entered

5. A. street          B. way        C. boat         D. restaurant

6. A. ran after      B. searched for  C. glared at      D. got rid of

7. A. blamed       B. saw         C. praised     D. helped

8. A. destroying        B. stealing     C. buying     D. eating

9. A. closed        B. tall          C. dull         D. open

10. A. toy               B. stall        C. building       D. mirror

11. A. fish          B. advice        C. money      D. food

12. A. tree          B. wall        C. stall       D. car

13. A. leaving      B. running      C. sleeping          D. spending

14. A. laid         B. let           C. drew        D. tasted

15. A. feet          B. eyes        C. shoulder       D. hands

16. A. edge         B. tiredness     C. wish         D. relation

17. A. friend       B. suggestion         C. way         D. head

18. A. went         B. stood        C. prayed       D. searched

19. A. even if      B. if            C. so         D. but

20. A. painful      B. nervous      C. enjoyful    D. near-sighted

单项选择题