问题 填空题

阅读材料,回答问题。

材料一: 2009年1月,某市酒吧发生一起特大火灾。该事故的起因是几个年轻人在酒吧内燃放烟花,引燃聚氨酯泡沫塑料天花板,聚氨酯泡沫塑料燃烧产生大量有毒烟气,造成人员中毒伤亡。

材料二:氢氧化镁是一种新型的阻燃剂。当温度达到380℃时,氢氧化镁开始分解出水蒸气,同时生成耐高温的氧化镁固体。利用氢氧化镁这一性质,将它添加在塑料等易燃性材料中能起阻燃作用。

(1)聚氨酯泡沫塑料属于               材料(填“有机”或“无机”)。请回答聚氨酯泡沫塑料的一点化学性质                                                

(2)燃着的烟花在引发这场火灾中所起的作用是                   。(填标号)

A. 提供氧气 B. 使可燃物的温度达到着火点 C. 提供可燃物

(3)根据灭火原理初步分析氢氧化镁能作阻燃剂的原因                       。(答一点)

(4)氢氧化镁受热分解的化学方程式为                                             

答案

(1)有机;可燃性

(2) B

(3)氢氧化镁受热分解生成的氧化镁覆盖在燃烧物表面,使燃烧物与氧气隔绝。 (合理答案均可) 

(4) Mg(OH)2MgO+H2O↑

阅读理解

阅读理解。

     Born in 1949, Diana Nyad took an early interest in swimming as a sport and was a Florida State

High School swimming champion. Like many young athletes, she had Olympic dreams, but a serious

illness kept her from competing in the Games. The disappointment didn't stop her from going forward.

Instead, she became interested in marathon swimming. A brilliant athlete, she was well-conditioned for

spending long periods of time in the water. As a long-distance swimmer, she would compete against

herself and the obstacles presented by distance, danger, cold, and exhaustion.

     For ten years Nyad devoted herself to becoming one of the world's best long-distance swimmers.

In 1970, she swam a ten-mile marathon in Lake Ontario, setting the women's record for the course.

In 1972 she set another record by swimming 102.5 miles from an island in the Bahamas to the coast

of Florida. Then she broke a third record when swimming around Manhattan Island in 1975.

     Nyad attempted to swim the distance between Florida and Cuba in 1978. Though the span of water

is less than 100 miles wide, it is rough and dangerous. After battling the water for two days, she had to

give for the sake of her own health and safety. Even so, she impressed the world with her courage and

strong desire to succeed. For Nyad her strength of purpose was just as important as reading Cuba.

That is how she defined success. It did not matter that her swim came up short; she believed she had

touched the other shore.

     When Nyad ended her career as a swimmer, she continued to try new things---travelling the world

as a reporter, writing books and giving public speeches about her life. Diana Nyad works to inspire

others, just as she did when she swam the waters of the world.

1. What prevented Nyad from taking part in the Olympic Games? (No more than 5 words)

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2. What does the underlined word "obstacles" mean? (1 word)

___________________________________________________________________________

3. What achievement did Nyad make in 1970? (No more than 10 words.)

________________________________________________________________________________

4. Why did Nyad believe that she had touched the other shore? (No more than 10 words)

___________________________________________________________________________

5. Please explain how you are inspired by Nyad. (No more than 20 words)

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单项选择题 A3/A4型题