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
Initial voyages into space introduced questions scientists had never before considered. Could an astronaut swallow food in zero
Initial voyages into space introduced questions scientists had never before considered. Could an astronaut swallow food in zero
admin
2013-05-29
57
问题
Initial voyages into space introduced questions scientists had never before considered. Could an astronaut swallow food in zero gravity? To keep things simple, astronauts on the Project Mercury ate foods squeezed out of tubes. It was like serving them baby food in a toothpaste container.
But these early tube meals were flavorless, and astronauts dropped too many pounds. "We know that astronauts have lost weight in every American and Russian manned flight," wrote NASA scientists Malcolm Smith in 1969. "We don’t know why." Feeding people in space was not as easy as it looked.
Floating around in space isn’t as relaxing as it might sound. Astronauts expend a lot of energy and endure extreme stresses on their bodies. Their dietary requirements are therefore different from those of their gravity-bound counterparts on Earth. For example, they need extra calcium to compensate for bone loss. ’A low-salt diet helps slow the process, but there are no refrigerators in space, and salt is often used to help preserve foods," says Vickie Kloeris of NASA. "We have to be very careful of that."
By the Apollo missions, NASA had developed a nutritionally balanced menu with a wide variety of options. Of course, all the items were freeze-dried or heat- treated to kill bacteria, and they didn’t look like regular food.
Today, the most elaborate outer-space meals are consumed in the International Space Station (ISS), where astronauts enjoy everything from steak to chocolate cake. The ISS is a joint venture between the U.S. and Russia, and diplomatic guidelines dictate the percentage of food an astronaut must eat from each country. NASA’s food laboratory has 185 different menu items, Russia offers around 100, and when Japan sent up its first crew member in 2008, about 30 dishes came with him. Due to dietary restrictions and storage issues, astronauts still can’t eat whatever they want whenever they feel like it.
In 2008, NASA astronaut and ISS crew member Sandra Magnus became the first person to try to cook a meal in space. It took her over an hour to cook onions and garlic in the space station’s food warmer, but she managed to create a truly delicious dish: grilled tuna (金枪鱼) in a lemon-garlic-ginger sauce---eaten from a bag, of course.
The passage mainly introduces ______.
选项
A、the variety of food options in space
B、the dietary need of astronauts in space
C、the problems of living in the space station
D、the improvement of food offered in space
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/3OTO777K
0
研究生英语学位课统考(GET)
相关试题推荐
PleasewriteonthetopicofShouldelderlypeoplelivewiththeiradultchildofabout200words.
AlthoughforthepurposeofthisarticleEnglishliteratureistreatedasbeingconfinedtowritingsinEnglishbynativesorin
For150yearsscientistshavetriedtodeterminethesolarconstant,theamountofsolarconstantenergythatreachestheEarth.
For150yearsscientistshavetriedtodeterminethesolarconstant,theamountofsolarconstantenergythatreachestheEarth.
HumanCloningTheapplicationsofcloningasweenvisionarenotnightmarishandinhumane,butwillimprovetheoverallqual
Itisreportedthatmentalhealthhasbecomeatroublesomeissue.Thenumberofpeoplecommittingsuicideisontherise.Youar
Peoplehavebeenpaintingpicturesforatleast30,000years.Theearliestpictureswerepaintedbypeoplewhohuntedanimals.
Alittlemorethanacenturyago,MichaelFaraday,thenotedBritishphysicist,managedtogainaudiencewithagroupofhighgo
Woman:Ithinktheauthorwasindicatingthathewassupportingthewar.Man:Hesaidonething,buthemeantanother.Youhave
Therearevariouswaysinwhichindividualeconomicunitscaninteractwithoneanother.Threebasicwaysmaybedescribedasth
随机试题
当韦尔奇接手通用电气时,美国正面临着日本、韩国等企业的强大竞争,不少行业在进口产品的冲击下不断衰落,例如钢材、纺织、造船、家电、汽车等。韦尔奇上任伊始,对公司的状况极为不满,认为公司染上了不少美国大公司都有的“恐龙症”,机构臃肿、部门林立、等级森严、层次繁
在编制年度财务会计报告之前,必须进行财产清查。()
乙公司年初未分配利润借方余额为200万元,本年利润总额为800万元。本年所得税费用为150万元,按净利润的10%提取法定盈余公积,提取任意盈余公积25万元,向投资者分配利润25万元。不考虑其他纳税调整事项,乙公司年末“利润分配一未分配利润”科目余额为(
在通货膨胀持续期,为了减轻通货膨胀对企业造成的不利影响,企业应当采取的防范措施包括()。
程序性知识也称为__________,是个人缺乏有意识的提取线索,只能借助于某种作业形式间接推测其存在的知识。
幼儿背诵儿歌时,比较容易记住前后的内容,中间的内容较难记忆且容易遗忘,这是()影响的结果。
社区警务战略的要求是:以社区为依据,立足社区,警民共建。()
3.5A英寸1.44MB软盘的每个扇区的容量是______。
What______toTomyesterday?
A、mockMichaelB、consoleMichaelC、criticizeMichaelD、persuadeMichaelB
最新回复
(
0
)