首页
登录
职称英语
[originaltext] The American Space Agency is continuing experiments that would
[originaltext] The American Space Agency is continuing experiments that would
游客
2025-01-07
17
管理
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://tihaiku.com/zcyy/3901874.html
相关试题推荐
Science,inpractice,dependsfarlessontheexperimentsitpreparesthanon
Science,inpractice,dependsfarlessontheexperimentsitpreparesthanon
Science,inpractice,dependsfarlessontheexperimentsitpreparesthanon
Science,inpractice,dependsfarlessontheexperimentsitpreparesthanon
[originaltext]OfficialsinVenezuelasaydozensofpeoplehavebeenkilledo
[originaltext]TomHanks,JuliaRoberts,ERandFriendsweresomeofihebig
[originaltext]TomHanks,JuliaRoberts,ERandFriendsweresomeofihebig
American’slifehasonceagainbeengreatlychangedbythenewageofscience
[originaltext]TheU.S.SpaceAgencyNASAsaysRussia’sorbitingMirspacest
[originaltext]Itis23,almost23:48universaltime.Thatmeansit’stimefo
随机试题
Culturalpluralismisthedynamicbywhichminoritygroupsparticipatefully
Thetrulyincompetentmayneverknowthedepthsoftheirownincompetence,a
Cryingishardlyanactivityencouragedbysociety.Tears,betheyofsorrow
[originaltext]M:Speakingofthesubjectoftoday,(12)whatchangeshaveyousee
( )主要受通货膨胀预期、中央银行的货币政策、经济周期和国际利率水平等的影响。
不属于肝性脑病病理基础的是A.含氮物质代谢障碍 B.假性神经递质积聚 C.G
依据国家电网公司变电检测通用管理规定,检测班组现场工作结束并完成自验后,向(
(2018年真题)根据增值税法律制度的规定,一般纳税人发生的下列行为中,可以开具
计算机病毒是()。A、寄生在芯片上的一种细菌 B、破坏计算机功能或数据的代码
A.受体 B.α受体 C.N2受体 D.N1受体 E.β受体可被普萘洛尔
最新回复
(
0
)