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
2025-01-08
39
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 laborator is a large circular contain er. 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 1 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 crops, 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B。
转载请注明原文地址:https://tihaiku.com/zcyy/3904240.html
相关试题推荐
[originaltext]Justawordofadvice:Ifyou’reafamouspersonlivinginLon
[originaltext]Officer:Mrs.Harrison(H),thanksverymuchforcomingdownh
[originaltext]Officer:Mrs.Harrison(H),thanksverymuchforcomingdownh
[originaltext]Officer:Mrs.Harrison(H),thanksverymuchforcomingdownh
"Ido."ToAmericansthosetwowordscarrygreatmeaning.Theycanevenchang
"Ido."ToAmericansthosetwowordscarrygreatmeaning.Theycanevenchang
[originaltext]Washington(dpa)-TheUnitedStates,nevershytolecturether
[originaltext]Washington(dpa)-TheUnitedStates,nevershytolecturether
[originaltext]FreshterroristhorrorwasbroughthometotheUKyesterdayas
[originaltext]NewsItemTwo McDonald’sCorp.unveileda
随机试题
Thereisno________tothehousefromthemainroad.A、accessB、avenueC、exposur
ChinaistosenditstopnegotiatoronNorthKorea’snuclearprogramtoPyon
工地试验室标准化建设核心不包括()。A:质量管理信息化 B:检测工作智能化
采购与付款循环一般包括的过程有:A、编制订购单 B、确认债务 C、处理和记录
关于慢性子宫颈炎的临床表现,错误的是A:分泌物呈稀薄泡沫状 B:患者可有腰骶部
2010年排名第二的海洋产业增加值比倒数第一的产业多()倍。 A.174
某房地产的建筑面积为2500m2,现状价值为2000万元,若现在将该房地产拆除重
沉缓脉的主病是A.阴寒凝滞 B.水饮内停 C.脾肾阳虚,水湿停留 D.寒凝
近年来,人们不断增加的对健康水源的需求催生了越来越多的滤水壶生产企业。目前这些企
关于交易性金融资产的计量,下列说法中正确的是()。A.取得交易性金融资产时,要
最新回复
(
0
)