首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Space is filled with radiant energy and beyond earth’s atmosphere this energy flow steadily and intensely from the sun. An abund
Space is filled with radiant energy and beyond earth’s atmosphere this energy flow steadily and intensely from the sun. An abund
admin
2013-03-11
64
问题
Space is filled with radiant energy and beyond earth’s atmosphere this energy flow steadily and intensely from the sun. An abundant and essential【C1】______of energy would be used in space by developing satellite solar【C2】______stations. To live in space, humans must be protected【C3】______the fierce intensity and penetrating sunlight. The colony will have to have enough energy to【C4】______a fairly uniform temperature. The sun is not dimmed【C5】______an atmosphere. Shaded materials not【C6】______to direct sunlight will almost be absolute zero, while the temperature can soar above the【C7】______point. The colony will need to have both heaters and【C8】______Fortunately, sun’s energy can be converted【C9】______electricity. Converting sun’s energy, we would【C10】______stations in the space that would intercept【C11】______sunlight. The stations intercept enough sunlight to【C12】______five nuclear reactors and they could be as【C13】______as nine miles long and four miles wide while they weigh twenty thousand tons. This is a【C14】______free way to generate electricity and cost no【C15】______than coal or nuclear energy. Solar cells do the actual converting. A useful material found in lunar soil is silicon which is used to make solar cells.【C16】______we can produce a large amount of these cells and then we avoid any problems of【C17】______the material from earth. A solar cell is made from two thin layers of silicon. Sunlight【C18】______on the cell shakes the electrons【C19】______, and then these electrons move off into an outside circuit, which is detected as an electrical current. Things are arranged【C20】______most of the work involved in generating the electricity is done by forces associated with the atoms themselves.
【C14】
选项
A、sewage
B、expense
C、gasoline
D、pollution
答案
D
解析
名词辨析题。利用太阳为能源是没有污染的发电途径,pollution free的意思是“没有污染”,所以应该选D。sewage“污水”;expense“费用”;gasoline“汽油”,这几个词不符合句意,故排除。
转载请注明原文地址:https://kaotiyun.com/show/beu7777K
0
大学英语四级
相关试题推荐
SunlightisagreatsourceofvitaminDinmostoftheworld.Yeta(an)【C1】______numberofexpertsthinkthatmanypeoplearen’
Forstudents,______(没有任何地方的教育币大学里的更好了);studyingthereislikebathingyourselfintheoceansofknowledge.
TherecessionistakingaserioustollonAmericanretail,bute-commercecouldemergeasawinner.Accordingtoanewrepor
Gettingajobcanbeespeciallydifficultforsomeonewithaprisonrecord.SoaprisontrainingprogramintheAmericanNorthwe
Haveyouever【B1】______whatotherpeopledowiththeiroldcomputers?Inthepasttheyhaveoftenpaidhighpricesfortheirol
______(不管观众中的一些人如何难为他).thecomedianalwayshadaquick,sharpreply.
A、teenpregnancyanddifficultyinschool.B、lowselfesteemandpoornutrition.C、difficultyinschoolandphysicalabuse.D、il
A、Byturningordinaryiceintosteam.B、Bypassingsteamoverdryice.C、Byheatingdryice.D、Bymixingdryicewithordinaryi
After1785,theproductionofchildren’sbooksintheUnitedStatesincreasedbutremainedlargelyreprintsofBritishbooks,of
Oneofthemostfamousandmosttalked-aboutactressestocomeoutofHollywoodhasdied.Film【B1】______ElizabethTaylordiedW
随机试题
删除表XS,则SQL语句应为()
简述我国宪法规定的公民的基本义务。
孔茨和韦里克将计划分为8层,其中的①使命;②规则;③政策;④方案四层,按照从抽象到具体的排列顺序是()。
护士为患者提供健康照顾,帮助其恢复健康,此时护士的角色是
1岁半男孩其基础代谢所需热量占总热量的比例为
铁路施工测量验收工作一般由()实施,检查工作应由()实施。
公安机关的职责具有责任性,是指公安机关及其人民警察必须依法履行职责,不履行职责或者滥用职权将受到纪律甚至法律的追究。()
“你要我遵守,你也必须遵守”属于皮亚杰儿童道德发展阶段论中的()阶段。
A、 B、 C、 D、 A
Readtheextractfromanarticleaboutnegotiationbelow.Inmostofthelines(41-52),thereisoneextraword.Iteitheris
最新回复
(
0
)