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、By electricity. B、Through an evaporation process. C、Through a freezing process. D、With the help of some special bacteria. B
A、By electricity. B、Through an evaporation process. C、Through a freezing process. D、With the help of some special bacteria. B
admin
2020-02-09
42
问题
(22)A few degrees can make a big difference when it comes to food storage. Food can so bad if they get too warm. But for many of the world’s poor, finding a good way to keep food cool is difficult. Refrigerators are costly and they need electricity. (23) Yet spoiled food not only creates health risks but also economic losses. Farmers lose money when they have to throw away products that they cannot sell quickly. But in 1995, a teacher in northern Nigeria named Mohammed Bah Abba found a solution. He developed the "Pot-in-Pot Preservation" or "Cooling System." It uses two round containers made of clay (黏土). A smaller pot is placed inside a larger one. The space between the two pots is filled with wet sand. The inner pot can be filled with fruit, vegetables or drinks. A wet cloth covers the whole cooling system. (24) Food in the smaller pot is kept from spoiling through a simple evaporation process. Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving. The evaporation process creates a drop in temperature of several degrees. This cools the inner pot and helps keep food safe from harmful bacteria. The invention became popular with farmers in other African countries. (25)Mohammed Bah Abba personally financed the first 5 000 pot-in-pot systems for his own community and five villages nearby. In 2000, the Rolex Watch Company of Switzerland honored him with the Rolex Award for Enterprise. This award recognizes people trying to develop projects aimed at improving human knowledge and well-being.
22. What is an important factor in food storage?
23. Why does the speaker say spoiled food can create economic losses?
24. How does the pot-in-pot system work?
25. What can we learn about Mohammed Bah Abba?
选项
A、By electricity.
B、Through an evaporation process.
C、Through a freezing process.
D、With the help of some special bacteria.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/jNp7777K
0
大学英语四级
相关试题推荐
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobservedThreeperiodsofdev
Peopleappeartobeborntocompute.Thenumericalskillsofchildrendevelopsoearlyandsoinexorably(坚定地)thatitiseasyt
Carsandotherroadvehiclesarethesinglemainsourceofharmfulnitrogenoxides.Roadtransportremainsthebiggestsourc
Carsandotherroadvehiclesarethesinglemainsourceofharmfulnitrogenoxides.Roadtransportremainsthebiggestsourc
Forthispart,youareallowed30minutestowriteanessaybasedontheproblemsofsharedbicyclesandthecountermeasures.Yo
A、Becausetheirenginefailedandtheiranchorwaslost.B、Becausetheygotlostatsea.C、Becausetheweatheristerrible.D、Be
A、Shewasdoinghousework.B、ShewasreadingJaneEyre.C、Shewasabsorbedinamovie.D、Shewastalkingwithhersisters.B男士说R
A、Alcoholabuse.B、Smoking.C、Depression.D、Schizophrenia.B信息明示题。由…treatingeverythingfromchronicdepressiontoalcoholabuse
A、Inacrowdedbar.B、Outsideacrowdedbar.C、Inthebookstore.D、Inthedepartmentstore.A由上一题解析可知,这位南非商人是在一个拥挤的酒吧里与他的梦中人相见的,
Collagen(胶原蛋白)supplementsA)Anysoupmakerworththeirsaltknowsthatagood,full-bodiedstockissemisolidandunstable
随机试题
风湿性病变渗出期的主要病变是()(2011年)
某卷烟厂通过自设非独立核算门市部销售自产卷烟,应当按照门市部对外销售额、销售数量计算征收消费税。()
耕地占用税的征税范围包括纳税人为建房或从事其他非农业建设而占用的()的耕地。
海丰百货公司兼营批发、零售、服务等业务,按照楼层分设家电部、黄金珠宝部、食品部、服装部、化妆品部、图书音像部,在财务部分账核算,统一纳税。2016年3月发生如下业务:(1)家电部采用交款提货方式零售彩电,取得现金收入80000元;以旧换新方式销售电冰箱,
小学教育在义务教育中的地位表现在三个方面,分别是:_____、_____、_____。
计算机中常用的数的表示形式有()。
所谓利他行为指的是有利于其他个体存活和生殖而不利于自身存活和生殖的行为,这种行为在自然界普遍存在,可用广义适合度和亲缘选择加以解释。根据上述定义,以下行为不属于利他行为的是:
一般来说,癌细胞进行转移会分为几个阶段:一是侵犯,此时癌上皮细胞会松开癌细胞之间的连接,使之“重获自由”而能移动到其他地方;二是“内渗”,此时癌细胞穿过血管或淋巴管的内皮进入循环系统;三是“外渗”,此时经过循环系统之旅洗礼的幸存者会穿过微血管的内皮细胞到达
一个国家中的文化精华,称其为“国粹”,中国的三大国粹为()。
针对很重视安全性的瑞典市场,美国一家台式计算机制造商开发出了一种特别的显示屏,这种显示屏产生的环绕使用者的电磁场比正常的屏幕产生的电磁场弱得多。尽管比其竞争者具有这方面的优势,该制造商在把这种显示屏引入美国市场时并未在广告中宣扬其是一种改进了安全性的产品。
最新回复
(
0
)