首页
登录
职称英语
Initial voyages into space introduced questions scientists had never before
Initial voyages into space introduced questions scientists had never before
游客
2025-03-27
37
管理
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. [br] According to Vickie Kloeris, serving a low-salt diet in space ______.
选项
A、is easier said than done
B、is not absolutely necessary
C、has worked as expected
D、will be the future trend
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4015186.html
相关试题推荐
Initialvoyagesintospaceintroducedquestionsscientistshadneverbefore
Initialvoyagesintospaceintroducedquestionsscientistshadneverbefore
Initialvoyagesintospaceintroducedquestionsscientistshadneverbefore
Initialvoyagesintospaceintroducedquestionsscientistshadneverbefore
Beforethearrivaloftheinternet,computerfileswereexchangedviastorag
Beforethearrivaloftheinternet,computerfileswereexchangedviastorag
Directions:Thereare10questionsinthispartofthetest.Readthepassag
Directions:Thereare10questionsinthispartofthetest.Readthepassag
Directions:Thereare10questionsinthispartofthetest.Readthepassag
Directions:Thereare10questionsinthispartofthetest.Readthepassag
随机试题
"Cool"isawordwithmanymeanings.Itstraditionalmeaningisusedto【C1】_
TheJournalofPublicTrustTheWallStreetJournal
[originaltext]Mr.W.:Goodmorning,Mr.Pitt.Dositdown.Mr.Pitt:Thankyou.
Jobsatisfactionisabusinesstermthatreferstoaperson’scontentmentwi
Whenitcomestousingtechnologytopromoteeducation,theprevailingwisdo
认为有人在议论他,街上的人及汽车上的人都用异样的眼光看他,这可能是()A.超价
夏季的气温普遍较高,施工现场应当加强和重视夏季防暑降温和消防安全工作,确保施工安
治疗麻疹初起,透发不畅,应选用的药组是()A.葛根、菊花、蔓荆子 B
关于计价错误责任承担,以下表述错误的是()A.因基金份额净值计价错误造成基金份
(2021年真题)下面表格中关键线路是( )。 A.B-E-H-I B.A-
最新回复
(
0
)