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
2023-12-19
35
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/3287314.html
相关试题推荐
[originaltext]Hi.Welcome.TodayI’mgoingtotalkabouthowchildrenlearn
[originaltext]W:Ah,Bill.Haveyougotaminute?M:Yes,butcanyoumakeitf
[originaltext]W:Ah,Bill.Haveyougotaminute?M:Yes,butcanyoumakeitf
[originaltext]QuestionNo.6Nowitiscommontofindfastfoodrestaurantseve
[originaltext]QuestionNo.6Nowitiscommontofindfastfoodrestaurantseve
[originaltext]QuestionNo.1Obviously,Carolhasbeenunhappywithherpresent
[originaltext]QuestionNo.1Obviously,Carolhasbeenunhappywithherpresent
[originaltext]QuestionNo.1Obviously,Carolhasbeenunhappywithherpresent
[originaltext]MostpeopleinBritainlikedrinkingtea.Britonsdrinkaqua
[originaltext]MostpeopleinBritainlikedrinkingtea.Britonsdrinkaqua
随机试题
Salesclerk:Goodmorning,madam.CanIhelpyou?Customer:Goodmorning.【D8】______
IntheruinsofthePalmBeachHotelyougetapowerfulsensethatanerais
WhyisPaulaunhappy?[br][originaltext]M:Hello.W:Hello,Sam.ThisisPaula
InEurope,therehasbeenaseriousdeclineinphysicalactivityoverthepa
大型临时设施总面积超过(),应备有消防专用的消防桶、消防锹、消防钩、盛水桶(池
根据《建设工程安全生产管理条例》,在施工合同中,属于建设单位安全责任的有()。
属于特殊培养基的是A.SS琼脂B.营养肉汤C.伊红亚甲蓝琼脂D.巧克力琼脂平板E
运用头脑风暴训练法训练学生的思维所应遵循的原则有哪些?
钢材的化学成分中,可显著降低钢材的可焊性,增加钢的冷脆性和时效敏感性,降低抗大气
关于系统性红斑狼疮的叙述,不正确的是( )。A.青年女性多见 B.属于自身免
最新回复
(
0
)