问题 选择题

下列对一些事实的解释中,合理的是

A.事实:水能灭火解释:水能降低可燃物的着火点

B.事实:一氧化碳可用于炼铁解释:一氧化碳具有氧化性

C.事实:氮气常用作保护气解释:氮气的化学性质稳定

D.事实:6 m3的氧气加压可装入0.04m3的钢瓶中解释:氧分子的体积变小

答案

答案:C

A水能灭火是因为水吸收了燃烧产生的热量,使可燃物的温度低于其着火点,没有改变其着火点。此项错误。

B一氧化碳可用于炼铁,利用了一氧化碳可将含氧化合物中的氧夺去的性质,属于还原性。此项错误。

C氮气用作保护气利用了氮气的化学性质稳定的性质。此项正确。

D6 m3的氧气加压可装入0.04m3的钢瓶中:利用了气体分子间隔比较大,易被压缩的性质。压缩过程中没变小的是分子间的间隔,分子大小不变。

点评:易错点为A选项。要注意着火点是物质固有的属性。灭火的原理是将可燃物的温度降低至其着火点以下。

阅读理解

A mother isdevastated, crying, yelling all she can in that dark corner. There was nobody tohear her yell and not a soul to calm her, because outside her house is a long winding lonely road.The wind was at rest and the leaves didn't rustle, silence filling the air. Loneliness was alreadykilling her, but no one knows what made her cry?

Losing something you love with all your heart isn't really the pain you can ever overcome.Radha lost her baby, her only means to live. She saw her child getting killed and the accidentwas terrible. One lonely night, she was walking down the street to get a breath of fresh air withher child hugged tight in her arms.

The whole time she walked with her child in her arms, the only thing that worried her wasAryan's future. She was imagining and feeling every day of the child's growthand figuringwhat she would have in store for him. But who knows what's in store for us tomorrow, life canchange in a second.

On that deserted road, were a few streetlights barely enough? It was this one light that couldbe seen from a distance,but as it came closer it got brighter and brighter. That light changedRadha's life into darkness forever. A speeding car came down that road. The driver came with a full speed throwing beer bottles out of his half open window. He was definitely drunk,and the speed took, everything in its path. Just then, there was a loud cry, and silence set in again.

But the mother wasn't hurt. She opened her eyes, unable to focus her eyes, and didn't seeAryan. After a few minutes when her sight cleared up she looked all over in a panic for her baby,but alas! ... The child hadn't even seen life.

Simple, don't drink and drive.You could take a life, but kill a number of people.

小题1:The word "devastated" in Paragraph 1 would probably mean      .

A.worried

B.scared

C.heart-broken

D.weather-beaten小题2:Which of the following statements is TRUE of Radha?

A.She had expected much of Aryan.

B.She got her eyes injured in the accident.

C.She was hit by one bottle on the arm.

D.She had everything ready for Aryan's future.小题3:The last sentence underlined implies that            .

A.drunk driving is absolutely forbidden

B.drunk driving is certain to kill a lot of people

C.the driver killed Aryan and his mother

D.there is more than one victim in a car accident小题4:What would be the best title for the passage?

A.The Death of a Miserable Child

B.A Sad Mother on a Windy Night

C.The Price for Another Man's Mistake

D.Overspeeding from Drunk Driving

单项选择题