“Haveyoueverbeenoutonaboatandfeltitliftedupbyawave?Orh...
问题详情:
“Have you ever been out on a boat and felt it lifted up by a wave? Or have you jumped in the water and felt the rush of energy as waves came over you?” asked Jamie Taylor of the Wave Energy Group at the University of Edinburgh. “There is certainly a lot of energy in waves,” he said. Scientists are working to use that energy to make electricity. Most waves are created when winds blow across the ocean. “The wind starts out by making little ripples(涟漪), but if they keep on blowing, those ripples get bigger and bigger and turn into waves,” Taylor said. “Waves are one of nature’s ways of picking up energy and then sending it off on a journey.” When waves come toward the shore, people can set up dams to block the water and send it through a large wheel called a turbine(涡轮机). The turbine can then power an electrical generator to produce electricity.
“The resource is huge,” said Janet Swain of the World Watch Institute. “We will never run out of wave power.” Besides, wave energy does not create the same pollution as other energy sources, such as oil or coal. Oceans cover three quarters of the Earth’s surface—that would make wave power seem ideal for creating energy throughout the world, though there are some weak points yet to overcome.
Swain said that wave power still costs too much money. She also said that its effects on sea animals are still unknown. What is more, wave power could affect fishing and boat traffic. Traditional sources of energy like oil and gas may someday run out. “Demand for energy to power our TVs and computers, drive our cars, and heat and cool our homes is rising rapidly throughout the world,” Swain said. In the future when you turn on a light, an ocean wave could be providing the electricity!
The writer uses the two questions at the beginning of the passage to .
test the readers’ knowledge about waves
draw the readers’ attention to the topic
show Jamie Taylor’s importance
invite the readers to answer them
The underlined phrase “picking up” is closest in meaning to .
A. starting again B. speeding up
C. improving D. gathering
We can make better use of wave energy if we .
shorten its journey to thousands of homes
build more small power stations on the oceans
reduce the cost of turning it into electric power
quicken the steps of producing electricity
It can be inferred that someday we might not worry about .
A. our power supply B. our boat traffic
C. air pollution D. our supply of sea fish
【回答】
BDCA
知识点:科普环保类阅读
题型:阅读理解
-
打秋千时,为使秋千越荡越高,人应有一个从直立到蹲下,又从蹲下到站直的过程.则打秋千时 A.人的机械能是守...
问题详情:打秋千时,为使秋千越荡越高,人应有一个从直立到蹲下,又从蹲下到站直的过程.则打秋千时 A.人的机械能是守恒的 B.人应在最低点站起来 C.人应在最高点站起来 D.人在最低点时失重【回答】C知识点:未分类题型:选择题...
-
某班抽取6名同学进行体育达标测试,成绩如下:80,90,75,80,75,80.下列关于对这组数据的描述错误的...
问题详情:某班抽取6名同学进行体育达标测试,成绩如下:80,90,75,80,75,80.下列关于对这组数据的描述错误的是( )A.众数是80 B.平均数是80 C.中位数是75 D.极差是15【回答】C知识点:数据的集中趋势题型:未分类...
-
已知铁的一种氧化物,其中含氧元素的质量分数为30%,则这种铁的氧化物的化学式为 ( ) A.FeO ...
问题详情:已知铁的一种氧化物,其中含氧元素的质量分数为30%,则这种铁的氧化物的化学式为()A.FeO B.Fe2O3C.Fe3O4 D.无法判断【回答】B知识点:金属的化学*质题型:选择题...
-
已知(1+ɑx)(1+x)5的展开式中x2的系数为5,则ɑ=( )A、-4 B、-...
问题详情:已知(1+ɑx)(1+x)5的展开式中x2的系数为5,则ɑ=( )A、-4 B、-3 C、-2 D、-1【回答】D知识点:计数原理题型:选择题...
相关文章
- Thejobsofthefuturehavenotyetbeeninvented.36 .Byhelpingt...
- Thejobsofthefuturehavenotyetbeeninvented.135.Byhelping...
- Thejobsofthefuturehavenotyetbeeninvented. 36.Byhelpingt...
- Ifyou’vealwayshopedtogiveupyour9-to-5jobtomovetoMaineto...
- 七选五阅读There'splentyofadviceoutthereaboutwhattodotogettos...
- Ifyou'veoftenbeentoldthatyouneedtobuildupyourselfconf...
- Thejobsofthefuturehavenotyetbeeninvented. 36 Byhelpingt...
- 阅读理解Doyouhopetodoalotofhomeworkeveryevening?Areyouinter...
- Youknowyouhavetoread“betweenthelines”togetthemostoutofa...
- TodayI’dliketoshareoneofmyunforgettableexperiencewithev...