问题 填空题

(4分)武汉市地铁6号线一期工程已开始施工,规划设站27座,线路全长36km;单程运行时间约1h。如图所示,6号线的汉阳琴台站与汉口武胜路站通过汉江隧道相连。

(1)列车单程运行的平均速度约为      km/h,相当于        m/s。

(2)若列车从汉阳琴台站出发行驶到汉口武胜路站,则列车的重力势能先                 。(填“增大”、“不变”或“减小”)

答案

36、10;减小、增大

题目分析:(1)由题意知:线路全长s=36km,单程运行时间约t=1h,则运行的平均速度约为v=s/t=36km/1h=36       km/h,而1m/s=3.6km/h,故相当于10m/s。(2)重力势能的大小与物体的质量和高度有关,列车从汉阳琴台站出发行驶到汉口武胜路站的过程中,质量不变,高度先变小后变大,故列车的重力势能先减小后增大。

问答题
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London—Lazy students can now give up on work altogether as two Oxford University students have made scores of A-grade essays(论文)on the website for students to copy.

The essays are on the new website,“revise.it.”

The website includes an “Essay Lab”designed to make cheating(舞弊)as effective and effortless as possible.

Its homepage announces to surfers(网上冲浪者):“The revise.it Essay Lab is a bank of hundreds of A-Level essays covering popular topics.”

“Next time you are asked to write an essay,why not see what we have on the subject—if you are in a lazy state of mind you can even use our guide to writing the essays and then just hand them in.”

Nick Rose and Jordan Mayo,both 19 and first from Manchester,spent much of their first year as students at the university setting up the website.There is no charge for downloading the essays.

“I have never been very good at essay writing,”Rose admitted.“We don’t see essay bank as a cheating way.It’s a surprising valuable resource.You can learn a lot by reading other people’s work on the subject.”

Among other tips,the website suggests inventing important speeches to give essays extra weight:“Popular people to quote(引用)are Douglass Hurd or Disraeli.”

Hurd was a foreign secretary in the 1980s and Disraeli was a 19th century prime minister.

Teachers are expressing their opinions by e-mail that they are angry about the website that “encourages students to cheat”,but students disagree.

According to Rose:“Exams are a fight.It’s us against them.”

65.It can be inferred from this passage that______.

A.students who visit the website“revise.it”are all lazy

B.students in Oxford University are all lazy

C.websites in Oxford University are all set up by students

D.websites can provide people with different kinds of information

66.Nick Rose and Jordan Mayo set up their website for the purpose of______.

A.helping students to cheat in exams

B.helping students to improve their writing

C.making money to pay for their schooling

D.making their teacher free

67.What Rose said at last suggests that in England______.

A.it is difficult for students to pass their exams

B.it is difficult for teachers to finish their teaching

C.students are not satisfied with the education system

D.students are too lazy to learn anything