问题 单项选择题

线切割技术是放电加工的又一改进,其电极是Φ0.20mm的软铜丝,为了补偿铜丝的烧蚀,去除可能*附到金属丝上的工件沉积微粒,金属丝从牵引丝盘到支承丝盘间缓慢地移动,且用去离子的水作电解液,这种装置可以均匀切割工件(),形状,小半径的圆弧轮廓等两锥空间的任何曲线。

A、弯曲的缝隙

B、各种

C、窄小缝隙

D、复杂的缝隙

答案

参考答案:D

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 A3型题