问题 单项选择题

生成树的算法正确的是().

A、非根交换机到根桥的路径唯一

B、根桥和非根桥通过bpdu来发送数据

C、阻塞端口是被禁止转发数据的,所以不参与生成树的收敛

D、生成树中,根交换机和非根交换机之间由于距离最短,所以在交换网络中路径是最优的

答案

参考答案:A

阅读理解

Years ago, I lived in a building in a large city. The next building only was a few feet away from mine. They was a woman lived there, and I had never met her, yet I could see she sat by her window each afternoon, drinking or reading.

After a few months, I began to notice that her window was dirty. Everything was unclear through the dirty window. I would say to myself. “I wonder why that woman doesn’t clean her window. It really looks terrible.”

One sunny morning I decided to clean my house, including washing the window.

Late in the afternoon when I finished the cleaning, I sat down by the window with a cup of coffee for a rest. What a surprise! Across the way, the woman sitting by her window was clearly visible (看见). Her window was clean!

It dawned on me. I had been criticizing (批评) her dirty window, but all the time I was watching hers through my own dirty window.

That was quite an important lesson for me. How often had I looked at others through the dirty window of my heart?

Since then, whenever I wanted to judge (评判) someone, I asked myself first, “Am I looking at him through my own dirty window?” I try to clean the window of my own world so that I may see the world about me more clearly.

小题1: The writer couldn’t see everything clearly through the window because __________.

A.the woman’s window was dirty

B.the writer’s window was dirty

C.the woman lived nearby

D.the writer was near-sighted小题2: The writer was surprised that _________.

A.the woman was sitting by her window

B.the woman’s window was still terrible

C.the woman did cleaning in the afternoon

D.the woman’s window was clean小题3: “It dawned on me” probably means “_______”.

A.I began to understand it

B.it cheered me up

C.I knew it grew light

D.it began to get dark小题4: It’s clear that ________.

A.the writer had never met the woman before

B.the writer often washed the window

C.they both worked as cleaners

D.they lived in a small town小题5: From the passage, we can learn _______.

A.one shouldn’t criticize others very often

B.one should often make his windows clean

C.one must judge himself before he judges others

D.one must look at others through his dirty windows.

单项选择题