问题 综合

下图为“北半球某地区某时刻地面等压线图”。读图,回答下列问题。(8分)

(1)从气压状况看,甲处是               ,从水平气流状况看为           

在其控制下,以                    天气为主。

(2)与甲地相比,乙地气温日较差      (大或小),判断依据是            

(3)丙处与丁处相比,           处的风力较大,其原因是:               

(4)丙地的风向为                        

答案

(1)高气压(1分)  反气旋(1分)   晴朗(1分)

(2)小(1分)   乙地受气旋控制,多阴雨天气;甲地受反气旋控制,天气晴朗。(1分)

(3)丙(1分)  等压线较丁处密集(1分)

(4)偏北风(西北风)(1分)

题目分析:(1)图示甲处中心气压较四周高,故判断为高压中心,高压中心水平气流呈辐散,故为反气旋。由于高压中心垂直方向上盛行下沉气流,故天气晴朗。(2)甲地天气晴朗,而乙地为低压中心,多阴雨天气,则白天多云,大气对太阳辐射的削弱作用强,气温不会太高,晚上多云,大气逆辐射强,气温不会太低,故温差较小。(3)图示丙处较丁处等压线密集,故水平气压梯度力较大,故风力较大。(4)直接根据图示的等压线分布,风向斜穿等压线,由高压指向低压,北半球地转偏向力向右偏,可画出风向。

点评:本题难度不大,属于常规考点,学生只要能抓住图示的气压分布基本信息,并掌握不同的天气系统的水平、垂直方向的气流运动,结合对天气的影响分析,画图分析更直观。

选择题
单项选择题

Several years ago, at the height of the dotcom boom, it was widely assumed that a publishing revolution, in which the printed word would be supplanted by the computer screen, was just around the corner. It wasn’t: for many, there is still little to match the joy of reading a printed book and settling down for one hour. But recently some big technology companies, including Google, Amazon, Microsoft and Yahoo, contend that the dream of bringing books online is still very much alive.

The digitizing of thousands of volumes of print is not without controversy. On Thursday, Google, the world’ s most popular search engine, posted a first installment of books on Google Print. This collaborative effort between Google and several world’s leading research libraries aims to make books available to be searched and read online free of charge. Although the books included so far are not covered by copyright, the plan has attracted the rage of publishers.

Five large book firms are suing Google for violating copyright on material that it has scanned and, although out of print, is still protected by law. Google has said that it will only publish short extracts from material under copyright unless given express permission to publish more, but publishers are unconvinced. Ironically, many publishers are collaborating with Google Print Publisher, which aims to give readers an online taste of books that are commercially available. The searchable collection of extracts and book information is intended to tempt readers to buy the complete books online or in print form.

Amazon, the world’s largest online retailer, has made plans to enter the mass e-book market by selling a vast array of goods. Given that Google should impinge upon its central territory, Amazon revealed that it would introduce two new services. Amazon Pages will allow customers to search for key terms in selected books and then buy and read online whatever part they wish. Amazon Upgrade will give customers online access to books they have already purchased as hard copies. Customers are likely to have to pay five cents a page, with the bulk going to the publisher.

Microsoft has also joined the online-book trend. In October, the software giant said it would spend around $ 200 million to digitize texts, starting with I50,000 that are in the public domain, to avoid legal problems. It will do so in collaboration with the Open Content Alliance. And on Thursday, coincidentally the same day as Google and Amazon announced their initiatives, Microsoft released details of a deal with the British Library, the country’s main reference library, to digitize some 25 million pages ; these will be made available through MSN Book Search, which will be launched next year.

Which is the best title for the text()

A. A Publishing Revolution

B. Amazon, the Largest Online Retailer

C. Online Books, a Prospering Service

D. Competition between Publishers and Net Companies