跑步对身体有什么好处？

干粉灭火器是利用压缩在钢瓶中的二氧化碳吹干粉[主要含有磷酸二氢铵（NH₄H₂PO₄）]来灭火．请回答：

（1）在钢瓶的表面涂油漆的作用是：______．

（2）压缩在钢瓶中的液态二氧化碳喷出后能灭火，其原理是______．

（3）为了变废为宝，报废灭火器中的NH₄H₂PO₄可作为______（填字母序号）使用．

A．氮肥B．磷肥C．钾肥D．复合肥料．

涉及业主产权专有部分的物业质量保修，由( )向建设单位提出，并由建设单位依法承担保修责任。

A．物业服务企业自行

B．施工单位

C．业主自行

D．政府主管部门

“She was born for the camera,” said a photographer who shot Liu Yifei’s picture when she was only eight.

Over the past year, Liu, an 18-year-old Chinese American, has shot to fame while playing Wang Yuyan in Jin Yong’s Eightfold Path of the Heavenly Dragon(《天龙八部》). Millions of teenagers have been drawn in by her light smile and beautiful long hair. Many magzines have described her as one of the most charming young actresses of 2004. People say that Liu will be even bigger this year.

“ She is so beautiful on TV. She has the special character to give flesh and blood to the fairy-like and beautiful Wang Yuyan,” said Yang Mingwei, a Senior 2 boy and Liu’s fan from Wuyi High School in Fujian.

Currently Liu filmed the TV series The return of the Condor Heroes(《神雕侠侣》), another Jin Yong novel. In the show aired this year, Liu played the Little Dragon female.

Liu is now a grade three student at the Beijing Film Academy, the star factory of China. But some people say that her success is only down to her beauty. When she returned to China with her mother at the age of 14, she did original work as a model. It was when a director saw her picture on an advertisement board on the street that her opportunity to work in TV arose.

“A pretty face does not last forever. To be a good actress you must work hard and have a professional attitude,” Liu said. Every day she spends hours practising all the kungfu kicks and punches for the show.

“There have been times during filming when I have remained hanging in the air on wires for half a day as the director keeps trying to get the perfect take,” said Liu recenly.

1.In the first paragraph, the photographer commented on Liu’s      .

A.beauty        B.talent as an actress

C.promising future D.special character

2.What does the underlined word “aired” probably mean?

A.Flown. B.Broadcast.   C.Published.   D.Recorded.

3.From Yang Mingwei, we learned that he meant Liu Yifei ______.

A.worked hard when playing Wang Yuyan

B.is more beautiful than Wang Yuyan

C.did a good job in the playing Wang Yuyan

D.was very lucky to play Wang Yuyan

4.In which part of a newspaper can you read the above passage?

A.National news.    B.Business.         C.Advertisement.   D.Famous people.

麻醉期间导致高血压患者发生低血压的原因有（）。

A.体位变动

B.全麻药抑制作用

C.椎管内麻醉所致交感神经阻滞

D.低血容量

E.迷走神经反射

室温时10mL某气态烃与过量的氧气混合，完全燃烧后的产物通过浓硫酸，再恢复到至室温，气体体积减少了35mL，剩余气体再通过氢氧化钠溶液，体积又减少了40mL。求气态烃的分子式并写出该分子式的同分异构体。