单项选择题：参与神经-骨骼肌接头处终板电位产生的是 A．化学门控通道 B．电压门控通道 C．机械

题型：单项选择题

无水硫酸铜在加热条件下能发生分解反应，生成氧化铜、二氧化硫、三氧化硫和氧气．某学生试图用下图所示装置来确定该化学反应中各物质的计量关系

试回答：

（1）加热过程中，试管A中发生的实验现象为______．

（2）装置E和F的作用是______；

（3）该学生使用装置B的本意是除去混合气体中的三氧化硫以提纯氧气，他的做法正确吗？为什么？______

（4）该学生利用上述装置将一定质量的无水硫酸铜置于A中加热使其分解，最后测得氧气的体积偏小，其原因可能是______（填序号）

A．无水硫酸铜未完全分解

B．实验结束时装置A中残留有气体

C.S

D．最后读量筒中的读数时，E中的液面低于F中的液面

（5）另一学生将4.8g无水硫酸铜充分加热使其完全分解后，用正确的实验方法除去了生成物中的二氧化硫和三氧化硫，最后测出氧气的体积为224mL（标准状况）．据此可计算出二氧化硫为______mol，三氧化硫为______mol．

（6）由上述实验数据可知无水硫酸铜受热分解的化学方程式为：______．

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完形填空。
It seems that the cities in the future will have to change. Because the world's population __1__ , there will be __2__ people in the cities tomorrow. It may be __3__ for any family to live in a house with land around it. There__4__ enough space for them. __5__ to solve this problem may be the skyscraper city (摩天城). The highest building in the world today is in Taipei. It's about 509 metres high. The skyscraper cities in the future will be many times __6__ . In a skyscraper city about 250,000 people will live. Nearly a million people can __7__ in four of these great buildings. Each skyscraper city will have four towns in it and each town will have ten villages. They will live, work and __8__ their free time in them. They won't need to leave the city __9__ they want to. They will be able to move about in the city by transport controlled __10__ computers. Let's imagine how the life will be then!
( ) 1. A. has grown ( ) 2. A. many ( ) 3. A. impossible ( ) 4 A. aren't ( ) 5. A. A way ( ) 6. A. lower ( ) 7. A. live ( ) 8. A. spend ( ) 9. A. until ( ) 10. A. by	B. is growing B. much B. possible B. won't be B. A road B. shorter B. study B. cost B. when B. at	C. are growing C. more C. important C. won't have C. An answer C. taller C. work C. pay C. while C. with	D. have grown D. larger D. necessary D. haven't D. An idea D. higher D. be D. take D. unless D. in

参与神经-骨骼肌接头处终板电位产生的是 A．化学门控通道 B．电压门控通道 C．机械