日日人人_亚洲美女在线视频_av手机在线播放_国产大片aaa_欧美中文日韩_午夜理伦三级

But it is a little complicating when you think about it. Sure, the deep, grey lines make an escalator's metal stairs more appealing to the eye. But regular stairs don't have grooves like these; why do escalators need them? Is it because of the movement?

It turns out those grooves serve a more functional purpose. And, yes, it does have to do with the movement, as well as with general cleanliness! Anyone who has ridden an escalator knows that the steps everlastingly circulate from the top to the bottom. You've surely noticed the ridged yellow lip at the top of the escalator. But here's what you may not have noticed: As an escalator's steps flatten, this ridge—also called the comb plate—sweeps away any trash or litter that might have fallen on the stairs. Those grooves lock the step and comb plate together, which makes it harder for any dangerous materials to slide underneath the lip. This prevents foreign objects from getting stuck in that gap, potentially causing the escalator to stop, or worse, break down completely.

That's not the only reason why the grooves were created, though. They are also a good place for water to pool together, protecting you from a bad fall on the slick surface.

So the next time you step on an escalator, take a moment to appreciate those metal grooves. They exist to make sure you get to your office meeting on time.

【1】What are the first two paragraphs trying to say?

A.Millions of people use escalators every year.

B.Few people think much about the grooves.

C.Escalators are complicated machines.

D.Grooves make the stairs look better.

【2】The ridge is mainly designed to____

A.clean off dangerous objects.

B. keep the stairs in movement.

C.flatten the steps.

D.lock the steps.

【3】What does the underlined word "slick” mean in Paragraph 4?

A.Smooth.B.Sticky.

C.Steep.D.Slippery.

【4】What's the passage mainly about?

A.The importance of escalators.

B.The reasons for grooves on stairs.

C.The look of grooves in escalators.

D.The safe ways of riding escalators.

增加：在缺詞處加一個漏字符號（∧），并在其下面寫出該加的詞。

刪除：把多余的詞用斜線（＼）劃掉。

修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞。

注意：

1.每處錯誤及其修改均僅限一詞；

2.只允許修改10處，多者（從第11處起）不計分。

When I first came to senior high school, it was hard for me to keep up in class and near dropped out. The problem was what I was not confident. Then coming Miss Li, my English teacher. She told me to try much hard. Whenever I lost heart, he would encourage me: You can make it. I spent a plenty of time memorizing words. We meet in her office each morning and she would urge me read English for at least 20 minutes. Eventually, something amazed happened and I got high marks in English. I really owe my great progresses to my teacher.

增加：在缺詞處加—個漏字符號（∧) ）,并在其下面寫出該加的詞。

刪除：把多余的詞用斜線（\ ）劃掉,.

修改：在錯的詞下劃一橫線，并在該詞下面寫出修改后的詞°

注意：1.每處錯誤及其修改均僅限--詞；

2.只允許修改10處，多者（從第11處起）不計分。

At about 9 o'clock last night, I was busy prepare for my test when a loud noise came through next door. My neighbor watched the football game on TV and kept the sound so much high that I couldn't go on studying. I covered my ear with hands, buried my head in books, and tried even to recite English texts and it was no use. I became impatient and decided to explain my difficult even if he might turned a deaf ear. To his great surprise, after hearing what I said, my neighbor apologized and turned down the TV immediate. Everything was back normal and in 30 seconds, the problem is solved.

為題，給�？�“英語角”寫一篇英文稿件。

注意：1．詞數不少于60;

2．開頭已給出，不計入總詞數。

提示詞：莫高窟the Mogao Caves

Silk Road Travel

This winter vacation I went to Dunhuang to explore the Silk Road with my classmates．

.

.

.

.

.

.

A.preparedB.having prepared

C.to preparedD.preparing

—No, but we ______. He didn’t return home at all.

A. needn’t have waited

B. couldn’t have waited

C. didn’t need to

D. should wait

A. Homework.B. Exams.C. Books.

A. In a supermarket.B. In a restaurant.C. In the man’s house.

---_______．Some are beneficial and encouraging.

A．You can say it again． B．You have me there.

C．You don’t say． D．You got it.

A. A jacket.B. A hat.C. A sweater.