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
A、short distance B、long distance C、all kinds of D、both A and B B这条信息出现在听力材料的最后部分,而且基本与题目相同“But the special growing containers ar
A、short distance B、long distance C、all kinds of D、both A and B B这条信息出现在听力材料的最后部分,而且基本与题目相同“But the special growing containers ar
admin
2010-04-28
32
问题
The American Space Agency is continuing experiments that would make possible extended periods of space travel. One of these experiments is aimed at finding ways to grow food in space. Scientists at the Kennedy Space Center in the Southern state of Florida are doing these experiments. They are attempting to grow vegetables that could survive without sunlight and dirt. Their laboratory is a large circular container. Computers control the levels of light, heat, water, fertilizer, and gases in the laboratory’s atmosphere. The plants are grown in special devices that hold about I centimeter of liquid plant food. Plastic sheets cover the roots of the plants. The containers are designed to keep the plants from floating away in the weightless environment of space. Water is collected and reused. Bacteria and fungi help turn plant matter into simple sugars that could be added to the astronaut’s food or fed to fish.
In the special containers plants can develop rapidly in a short period of time. Astronauts would need only to watch the computers to see if the plants are getting what they need.
The scientists at the Kennedy Space Center laboratory have been able to produce small kinds of wheat, soybeans, lettuce, and white potatoes. Universities around the country are testing other small size clops, such as carrot, tomatoes and rice in special growing containers.
Scientists also are attempting to genetically design some of these plants to contain high levels of proteins. They are studying ways to use parts of the plants that can not be eaten and they will also try to find ways of using human wastes to fertilize the plants. Scientists at the Johnson space Center in Houston, Texas, are trying to grow crops in a mixture of volcanic dirt and crashed glass. The matter is similar to soil found on the moon. Lettuce and wheat have grown well in the mixture. Space Agency scientists hope to test some version of the experimental gardens on the planned space station. But the special growing containers are expected to be used mostly for long distance space travel. A trip to Mars, for example, is expected to take about one year. When the astronauts reach Mars, they could try to use the soil there to grow other crops.
选项
A、short distance
B、long distance
C、all kinds of
D、both A and B
答案
B
解析
这条信息出现在听力材料的最后部分,而且基本与题目相同“But the special growing containers are expected to be used mostly for long distance space travel”。因此应选D。
转载请注明原文地址:https://kaotiyun.com/show/BRqO777K
0
专业英语八级
相关试题推荐
NapoleonfamouslydescribedtheBritishasanationofshopkeepers.Thesedaysitwouldbeequallytruetodescribethemasana
Goodmorning,class.Today’stopicis"IdiomsandTheirOrigins".Anidiomisaphraseorexpressionwith【C1】______.Themeaning
Thetwoeconomistscalltheirpaper"MentalRetirement,"andtheirfindingsfromtheUnitedStatesand12Europeancountriessug
A、Forlanguagelearners,theInternetenvironmentlacksreal-lifesocialfactors.B、LearningalanguagethroughtheInternetmay
ClimatechangethreatenssustainabledevelopmentandalleightMillenniumDevelopmentGoals.Theinternationalcommunityagreed
Newsreport:China’spopulationofsingleadultsisestimatedat200million.Theproportionofadultswholivebythemselve
Whyshouldmankindexplorespace?Perhapsthebestreasonforexploringspaceisourbuilt-in【B1】______predispositiontoexpand
A、Wattskilled13women.B、Wattswouldreceiveamedicaltreatmentbeforefacingthenewtrial.C、Wattswouldbe60onMay8,20
About______ofNewZealandersarefoundinNorthIsland.
AMERICARES’firstairlifttoIndiainresponsetothetsunamihasarrivedinChennai,carrying36tonsofmedicines,medicalequ
随机试题
违法事实不能成立的,不得给予行政处罚。
简述名牌战略的类型。
复制中的RNA引物()
A、遗传性球形红细胞增多症B、地中海贫血C、遗传性椭圆形红细胞增多症D、免疫性血小板减少性紫癜E、自体免疫性溶血性贫血体内产生自体抗体的是()
肺脓肿的主要临床表现,下列哪项是不典型的
甲公司为增值税一般纳税人,于2009年2月3日购进一台不需要安装的生产设备,收到的增值税专用发票上注明的设备价款为3000万元,增值税额为510万元,款项已支付;另支付保险费15万元,装卸费5万元。当日,该设备投入使用。假定不考虑其他因素,甲公司该设备
下列各项,增值税一般纳税企业需要视同销售计算销项税的有()。
采用相关分析法检验多名评定者评定的一致性,组内相关系数达到()以上即可接受。
阅读下面这首乐府诗,完成试题。雨雪曲江总①雨雪隔榆溪⑦,从军度陇西③。绕阵看狐迹,依山见马蹄。天寒旗彩坏,地暗鼓声低。漫漫愁
Theprocessofacquiringtheself-disciplineforJapanesebeginsinchildhood.Indeed,onemaysayitbeginsatbirth—howearly
最新回复
(
0
)