Theoddnessoflifeinspaceneverquitegoesaway.Herearesomeex...
問題詳情:
The oddness of life in space never quite goes away. Here are some examples.
First consider something as simple as sleep. Its position presents its own challenges. The main question is whether you want your arms inside or outside the sleeping bag. If you leave your arms out, they float free in zero gravity, often giving a sleeping astronaut the look of a funny balled (芭蕾)dancer. “I’m an inside guy,” Mike Hopkins says, who returned from a six-month tour on the International Space Station. “I like to be wrapped up.”
On the station, the ordinary becomes strange. The exercise bike for the American astronauts has no handlebars. It also has no seat. With no gravity, it’s just as easy to pedal violently. You can watch a movie while you pedal by floating a microcomputer anywhere you want. But station residents have to be careful about staying in one place too long. Without gravity to help circulate air, the carbon dioxide you exhale (呼氣) has a tendency to form an invisible (隱形的)cloud around you head. You can end up with what astronauts call a carbon-dioxide headache.
Leroy Chiao, 54, an American retired astronaut after four flights, describes what happens even before you float out of your seat,”Your inner ear thinks you’re falling. Meanwhile your eyes are telling you you’re standing straight. That can be annoying—that’s why some people feel sick.” Within a couple days —truly terrible days for some —astronauts’ brains learn to ignore the panicky signals from the inner ear, and space sickness disappears.
Space travel can be so delightful but at the same time invisibly dangerous. For instance, astronauts lose bone mass. That’s why exercise is considered so vital that National Aeronautics and Space Administration (NASA) puts it right on the workday schedule. The focus on fitness is as much about science and the future as it is about keeping any individual astronauts return home, and, more importantly, how to maintain strength and fitness for the two and a half years or more that it would take to make a round-trip to Mars.
is the major challenge to astronauts when they sleep in space?
A. Seeking a way to fall asleep quickly
B. Choosing a comfortable sleeping bag
C. Deciding on a proper sleep position
D. Finding a right time to go to sleep.
astronauts will suffer from a carbon-dioxide headache when _____.
A. the y circle around on their bikes
B. they use microcomputers without a stop
C. they watch a movie while pedaling
D. they exercise in one place for a long time
astronauts feel sick on the station during the first few days because _____.
A. their senses stop working
B. their brains receive contradictory (矛盾的)messages.
C. they float out of their seats unexpectedly
have to stand up straight
of the NASA’s major concerns about astronauts is _____.
A. how much exercise they do on the station
B. how they can remain healthy for long in space
C. whether they can recover after returning home
D. whether they are able to go back to the station
【回答】
CDBB
知識點:人物傳記 故事類閱讀
題型:閱讀理解
-
早春二月的某一天,A市的平均氣溫爲-5℃,B市的平均氣溫爲3℃,則當天B比A市的平均氣溫高
問題詳情:早春二月的某一天,A市的平均氣溫爲-5℃,B市的平均氣溫爲3℃,則當天B比A市的平均氣溫高____________℃.【回答】8提示:3-(-5)=8.知識點:有理數的加減法題型:填空題...
-
美是一種感覺,當人體下半身長與身高的比值越接近0.618時,越給人一種美感.某女士身高165cm,下半身長x與...
問題詳情:美是一種感覺,當人體下半身長與身高的比值越接近0.618時,越給人一種美感.某女士身高165cm,下半身長x與身高l的比值是0.60,爲儘可能達到好的效果,她應穿的高跟鞋的高度大約爲( )(A)4cm (B)6cm (C)8cm (D)10cm【回答】...
-
簡答題(選做一題)(5分)20.閱讀下面《紅樓夢》選段,依據原著故事情節,回答問題。一句話未了,忽見一個老婆子...
問題詳情:簡答題(選做一題)(5分)20.閱讀下面《紅樓夢》選段,依據原著故事情節,回答問題。一句話未了,忽見一個老婆子忙忙走來,說道:“這是那裏說起!金釧兒姑娘好好的投井死了!”金釧兒因何投井自盡?她死後,王夫人和寶釵對此作何反應?請簡述。21.閱讀下面《歐也妮·葛朗臺》選段,...
-
在探究“光對鼠婦生活的影響”實驗中屬於變量的是( )A.溫度 B.溼度 ...
問題詳情:在探究“光對鼠婦生活的影響”實驗中屬於變量的是( )A.溫度 B.溼度 C.光照 D.土壤【回答】C知識點:生物圈是最大的生態系統題型:選擇題...
相關文章
- Ifoverweightpeopleeatlessandtakemoreexercise,they’llso...
- HowtoCalmYourTeen'sNervesbeforeanExamStressisafeelingof...
- Seetheworld…forfree!Travelingisexpensive.Butyoucanseeth...
- 閱讀並完成相關任務Shynessmeansfeelingnervousorfrightenedwhenyou’...
- ---Thestudentslookverytiredafterthesportsmeeting.---We...
- It'sinterestingtoseehowpeoplemakeuseofthetimetheyspendo...
- 任務型閱讀Doyouneedusefulandinterestingbooks?Herewe'vegotple...
- Theresultoftheexperimentwasverygood,
- Dr.Kwasoneofmyfavoriteprofessorsincollege.Hewasuniquebe...
- 閱讀理解ThedesignerofAppleComputer,StevenJobs,wasnotquitesu...