问题 单项选择题

某城市全年只有一个盛行风向,且其最小风频风向与盛行风向转换夹角大于90°,在进行城市用地规划布局时,工业用地应放在( )。

A.盛行风向的下风方向

B.最小风频之下风位

C.最小风频之上风位

D.盛行风向的两侧

答案

参考答案:C

解析:[试题解析] 在进行城市用地规划布局时,为了减轻工业排放的有害气体对生活居住区的危害,通常把工业区布置于生活居住区的下风位,但应同时考虑最小风频风向,静风频率、各盛行风向的季节变换及风速关系。如全年只有一个蛊行风向,且与此相对的方向风频最小,或最小风频风向与盛行风向转换夹角大于90度,则工业用地应放在最小风频之上风位,居住区位于其下风位; 当全年拥有两个方向的盛行风时,应避免使有污染的工业处于任何一个蛊行风向的上风方向,工业区及居住区一般可分别布置在盛行风向的两侧。风速与污染危害的关系一般被认为是反比关系,即风速越大,污染物越易扩散,从而降低了有害物质的浓度,这在处理多盛行风向城市的工业布局时有一定的参考意义。

单项选择题
阅读理解

Ⅲ 阅读(共两节,满分40分)

第—节 阅渎理解(共15小题;每小题2分,满分30分)

阅读—列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将   该项涂黑。

How should one invest a sum of money in these clays of inflation (通货膨胀)? Left in a bank it will hardly keep its value, however high the interest rate. Only a brave man, or a very rich one, dares to buy and sell on the Stock Market. Today it seems that one of the best ways to protect your savings, and even increase your wealth is to buy beautiful objects from the past. Here I am going to offer some advice on collecting antique clocks, which I personally consider are among the most interesting of antiques.

I sometimes wonder what a being from another planet might report back about our way of life. "The planet Earth is ruled by a mysterious creature that sits or stands in a room and makes a strange ticking sound. It has a face with twelve black marks and two hands. Men can do nothing without its permission, and it fastens its young round people's wrists so that everywhere men go they are still under its control. This creature is the real master of Earth and men are its slaves."

Whether or not we are slaves of time today depends on our culture and personality, but it is believed that many years ago kings kept special slaves to tell the time. Certain men were very clever at measuring the time of clay according to the beating of their own hearts. They were made to stand in a fixed place and every hour or so would shout tire time. So it seems that the first clocks were human beings.

However, men quickly found more convenient and reliable ways of telling the time. They learned to use the shadows cast by the sun. They marked the hours on candles, used sand in hour- glasses, and invented water-clocks. Indeed, any serious student of antique should spend as much time as possible visiting palaces, stately homes and museums to see some of the finest examples of clocks from the past.

Antique clocks could be very expensive, but one of the joys of collecting clocks is that it is still possible to find quite cheap ones for your own home. After all, if you are going to be ruled by time, why not invest in air antique clock and perhaps make a future profit?

41. According to the passage, collecting antique clocks____.

A. can hardly keep the value of your savings   B. will cost much of your savings

C. may increase your wealth               D. needs your bravery

42. By quoting (引用) the remark of a being from another planet, the author intends to____.

A. suggest human beings are controlled by a clock

B. describe why clocks can rule the planet Earth

C. tell readers what clocks look like

D. compare chicks to human beings

43. Which of the following is NOT mentioned as a way to measure the time?

A. Counting the beating of one's own heart.

B. Making use of candles, sand and water.

C. Observing shadows cast by the sun.

D. Keeping slaves busy day and night.

44. The underlined phrase stately homes in paragraph 4 means

A. state-owned houses            B. houses in very good condition

C. grand houses open to the public  D. houses where statesmen meet regularly

45. The purpose of the passage is

A. to introduce the culture of antique clocks

B. to offer some advice on collecting antique clocks

C. to compare different ways to make a future profit

D. to explain convenient and reliable ways of telling time