问题 解答题

阅读下面材料,并回答问题:

三峡之最

三峡工程是中国,也是世界上最大的水利枢纽工程,是治理和开发长江的关键性骨干工程.它具有防洪、发电、航运等综合效益.

●三峡水库总库容393亿立方米,防洪库容221.5亿立方米,水库调洪可消减洪峰流量达每秒2.7─3.3万立方米,是世界上防洪效益最为显著的水利工程.

●三峡水电站总装机1820万千瓦,年发电量846.8亿千瓦.时,是世界上最大的电站.

●三峡水库回水可改善川江650公里的航道,使宜渝船队吨位由现在的3000吨级堤高到万吨级,年单向通过能力由1000万吨增加到5000万吨;宜昌以下长江枯水航深通过水库调节也有所增加,是世界上航运效益最为显著的水利工程.

思考:

(1)三峡水电站年发电量846.8亿千瓦.时,一个普通家庭一天用电5千瓦.时,三峡水电站可同时供多少普通家庭一年的用电?(保留3个有效数字)(2)宜都市38万人,平均一户4个人,三峡水电站一年可同时供多少个像宜都市这样的城市的用电?(结果保留整数)

答案

(1)84 680 000 000÷5÷365≈4.64×107(个).

答:三峡水电站可同时供4.64×107个普通家庭一年的用电.

(2)84 680 000 000÷(380 000÷4×5×365)≈488(个).

答:三峡水电站一年可同时供488个像宜都市这样的城市的用电.

单项选择题 A1型题
阅读理解

What is your favorite color? Do you like yellow, orange, or red? If you do, you must be an active person who enjoys life. Do you like blue? Then you are probably quiet, shy, and would rather follow than lead.

Colors do influence our moods (情绪). A yellow room makes most people feel more cheerful and more relaxed than a dark green one; and a red dress brings warmth and cheer to the saddest winter day. On the other hand, black is depressing(令人压抑的). There was a black bridge over the Thames River, near London. The number of people who killed themselves on that bridge used to be larger than on any other bridge in the area -- until it was repainted green.

Light and bright colors make people not only happier but also more active. In the factory, the workers will work better, harder, and have fewer accidents when their machines are painted orange rather than black.

小题1:An active person may like ____   

A.yellow, orange, or red

B.yellow, black, or red

C.orange, blue, or black

D.black, red, or orange小题2:Most people feel more __ in a yellow room than in a dark green one.

A.tired

B.bored

C.worried

D.relaxed小题3:More people killed themselves on the black bridge than on any other bridge probably because ____

A.the bridge was very tall

B.the bridge was too crowded

C.people didn't like the bridge

D.the color of the bridge was depressing小题4:In the factory, when the machines are painted orange, the workers will work __

A.worse

B.harder

C.more slowly

D.more angrily