Theoddnessoflifeinspaceneverquitegoesaway.Herearesomeex...
问题详情:
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 (呼气) has a tendency to form an invisible (隐形的)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
知识点:人物传记 故事类阅读
题型:阅读理解
-
早春二月的某一天,A市的平均气温为-5℃,B市的平均气温为3℃,则当天B比A市的平均气温高
问题详情:早春二月的某一天,A市的平均气温为-5℃,B市的平均气温为3℃,则当天B比A市的平均气温高____________℃.【回答】8提示:3-(-5)=8.知识点:有理数的加减法题型:填空题...
-
美是一种感觉,当人体下半身长与身高的比值越接近0.618时,越给人一种美感.某女士身高165cm,下半身长x与...
问题详情:美是一种感觉,当人体下半身长与身高的比值越接近0.618时,越给人一种美感.某女士身高165cm,下半身长x与身高l的比值是0.60,为尽可能达到好的效果,她应穿的高跟鞋的高度大约为( )(A)4cm (B)6cm (C)8cm (D)10cm【回答】...
-
简答题(选做一题)(5分)20.阅读下面《红楼梦》选段,依据原著故事情节,回答问题。一句话未了,忽见一个老婆子...
问题详情:简答题(选做一题)(5分)20.阅读下面《红楼梦》选段,依据原著故事情节,回答问题。一句话未了,忽见一个老婆子忙忙走来,说道:“这是那里说起!金钏儿姑娘好好的投井死了!”金钏儿因何投井自尽?她死后,王夫人和宝钗对此作何反应?请简述。21.阅读下面《欧也妮·葛朗台》选段,...
-
在探究“光对鼠妇生活的影响”实验中属于变量的是( )A.温度 B.湿度 ...
问题详情:在探究“光对鼠妇生活的影响”实验中属于变量的是( )A.温度 B.湿度 C.光照 D.土壤【回答】C知识点:生物圈是最大的生态系统题型:选择题...
相关文章
- 阅读理解ThedesignerofAppleComputer,StevenJobs,wasnotquitesu...
- It'sinterestingtoseehowpeoplemakeuseofthetimetheyspendo...
- HowtoCalmYourTeen'sNervesbeforeanExamStressisafeelingof...
- ---Thestudentslookverytiredafterthesportsmeeting.---We...
- 阅读并完成相关任务Shynessmeansfeelingnervousorfrightenedwhenyou’...
- Dr.Kwasoneofmyfavoriteprofessorsincollege.Hewasuniquebe...
- Ifoverweightpeopleeatlessandtakemoreexercise,they’llso...
- 任务型阅读Doyouneedusefulandinterestingbooks?Herewe'vegotple...
- Theresultoftheexperimentwasverygood,
- Seetheworld…forfree!Travelingisexpensive.Butyoucanseeth...