问题 多选题

(多选)下列说法中正确的是(    )

A.用久了的电灯灯丝变细是升华现象

B.被水蒸气烫伤比沸水烫伤更严重是因为水蒸气液化时要放出热量

C.秋天的早晨,大雾逐渐散去是液化现象

D.人出汗后,微风吹过感到凉爽,是因为汗液蒸发加快,带走更多的热量

答案

A B D

题目分析:如图所示为物质三种状态之间的六种物态变化及吸、放热情况。影响蒸发快慢的因素有液体的温度、液体的表面积、液体表面的空气流动速度。

根据上图:选项A灯丝变细是由固体直接变成气体属于升华现象;选项B气体液化时要放出大量的热;选项D中蒸发属于汽化,发生汽化时要吸热,又因吹风加快了蒸发从面带走更多的热;选项C雾散开是由液体变成气体属于汽化。所以选A、B、D。

填空题
阅读理解

I have a friend named Monty Roberts who owns a horse ranch in San Ysidro. He has let me use his house to put on fund-raising events to raise money for youth at risk programs.

The last time I was there he introduced me by saying, "I want to tell you why I let Jack use my house.” It all goes back to a story about a young man who was the son of a horse trainer who would go from stable to stable, race track to race track, farm to farm and ranch to ranch, training horses. As a result, the boy's high school career was continually interrupted. When he was a senior, he was asked to write a paper about what he wanted to be and do when he grew up.”

That night he wrote a seven-page paper describing his goal of someday owning a horse ranch.He wrote about his dream in great detail and he even drew a diagram of a 200-acre ranch, showing the location of all the buildings, the stables and the track. Then he drew a detailed floor plan for a 4,000-square-foot house that would sit on a 200-acre dream ranch.”

He put a great deal of his heart into the project and the next day he handed it in to his teacher. Two days later he received his paper back. On the front page was a large red F with a note that read, "See me after class.”

小题1:Why can the writer use Roberts's house to raise money for youth at risk programs?

A.Because they are good friends.

B.Because Monty Roberts has a poor childhood.

C.Because Monty Roberts like to help youth.

D.Because the youth has the same dream as Montv Roberts.小题2:What do you think of Monty Koberts' goal of a horse ranch at that time?

A.dream

B.romantic

C.real

D.false小题3:What would happen after the teacher gave a note "See me after class.”?

A.Monty Roberts got very angry at this.

B.The teacher would criticize him.

C.The teacher wanted to tell him that his dream would come true.

D.The teacher would encourage him.