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Another thing an astronaut has to learn about is eating in space. Food is weightless, just

as men are.

Food for space has to be packed in special ways. Some of it goes into tubes that a man can squeeze into his mouth. Bite-sized cookies are packed in plastic.

There is a good reason for covering each bite. The plastic keeps pieces of food from travelling in the spaceship. On the earth very small pieces of food would simply fall to the floor. But gravity doesn' t pull them to the floor when they are out of the plastic in a spaceship. (78) They move here and there and can get into a man' s eyes or into the spaceship' s instruments. If any of the instruments is blocked, the astronauts may have trouble getting safely home.

As astronauts travel on longer space trips, he must take time to sleep. An astronaut can fit himself to his seat with a kind of seat belt. Or, if he wants to, he can sleep in a sleeping bag which is fixed in place under his seat. But be careful he must put his hands under the belt when he goes to sleep. This is because he is really afraid that he might touch one of controls that isn' t supposed to be touched until later.

Why would astronauts cover each bite of food in space？

A．Because small pieces of food would fall down to the floor.

B．Because weightless pieces of food might make trouble when they travel around.

C．Because they haven' t enough food for longer trips.

D．Because astronauts don' t want to waste food.

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发布时间：2020-09-17

更多“Another thing an astronaut has to learn about is eating in space. Food is weightless, just”相关的问题

第1题

If you want to be left alone on an elevator, the best thing to do is______.A．to look into

If you want to be left alone on an elevator, the best thing to do is______.

A．to look into another passenger's eyes

B．to avoid eye contact with other passengers

C．to signal you are nor a threat to anyone

D．to keep a distance from other passengers

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第2题

It is one thing to enjoy listening to good music, but it is quite _____ to perform.

It is one thing to enjoy listening to good music, but it is quite _____ to perform. skillfully yourself.

A、another

B、other thing

C、others

D、the other

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第3题

Secrets to Success 1. Many things contribute to success, but the most important is willpower. 2. A

Secrets to Success

1. Many things contribute to success, but the most important is willpower.

2. Another thing that has greater effect on success is diligence.

3. However, to be successful, one should also be filled with confidence.

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第4题

What do we learn from the last para. ？ ______.A．If we focus our attention on one thing, we

What do we learn from the last para. ？ ______.

A．If we focus our attention on one thing, we might forget another

B．Memory depends to a great extent on the environment

C．Reception helps improve our memory

D．If we keep forgetting things, we'd better return to where we were

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第5题

According to the author, the reason why we go wrong about our friends is that ______.A

According to the author, the reason why we go wrong about our friends is that ______.

A)we fall to listen carefully when they talk

B)people tend to be annoyed when we cheek what they say

C) people usually state one thing hut means another

D)we tend to doubt what our friends say

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第6题

According to the author, the reason why we go wrong about our friends is that ______.A．we

According to the author, the reason why we go wrong about our friends is that ______.

A．we fail to listen carefully when they talk

B．people tend to be annoyed when we check what they say

C．people usually state one thing but mean another

D．we tend to doubt what our friends say

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第7题

There is one thing that everyone wants more than anything else. Some people try to get it

by making money. They think that when they have enough money to buy such things as houses, farms, and cars, they will have the one thing that everyone wants.

Other people believe that if they know enough they will find this thing. They study all their lives in search of it. Still others think that if they have power, they will find this thing. They keep telling themselves: when I am a boss, I will no longer have to search for this thing.

What is it that everyone wants more than anything else？ What is it that all of us keep working and striving for each day？ It is happiness.

Happiness is a strange thing. It does not mean the same to all men. What will make one man happy may not make another man happy. Some men say that happiness comes from helping others; other men say that happiness comes from making life more pleasant for everyone. What do you mean when you say: "That makes me happy？"

Read what different people have said about happiness. Perhaps you will learn something that will bring you peace of mind, comfort, money or it may bring you what you search for -- happiness.

The main idea of the above article is ______.

A．Happiness means the same to everyone

B．Happiness is the thing that everyone wants most of all

C．Money makes one happy, so does helping others

D．Both A and C

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第8题

根据以下资料，回答9~12题。 There is one thing that everyone wants more than anything else．

Some people try to get it by making money．They think that when they have enough money to buy such things as houses, farms, and cars, they will have the one thing that everyone wants. Other people believe that if they know enough they will find this thing．They study all their lives in search of it．Still others think that if they have power, they will find this thing．They keep telling themselves: when I am a boss, I will no longer have to search for this thing． What is it that everyone wants more than anything else？ What is it that all of us keep working and striving for each day？ It is happiness. Happiness is a strange thing．It does not mean the same to all men．What will make one man happy may not make another man happy．Some men say that happiness comes from helping others; other men say that happiness comes from making life more pleasant for everyone．What do you mean when you say "That makes me happy"？ Read what different people have said about happiness．Perhaps you will learn something that will bring you peace of mind, comfort, money or it may bring you what you search for --happiness． "Some people try to get it by making money." The underlined "it" means __. A．happiness B．the preceding sentence C．money D．such things as house, farms and cars

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第9题

Everyone seems to be in favor of progress. But " progress" is a funny word. It doesn't nec

essarily mean that something has become stronger, wiser, or better. It simply means changing it from being one thing to another and sometimes it turns out to be worse than before.

Consider medicine, for instance. No one can deny that medical progress has enriched our lives tremendously. Because of medical advances, we eat better, live easier and are able to take care of ourselves more efficiently. We can cure disease with no more than one injection or a pill. If we have a serious accident, surgeons can put us back together again. If we are born with something defective, they can repair it. They can make us happy, restore our normality, ease our pain, replace worn parts and give us children. They can even bring us back from the dead. These are wonderful achievements, but there is a price we have to pay.

Because medicine has reduced infant mortality and natural death so significantly, the population has been rising steadily, in spite of serious efforts to reduce the rate of population growth. Less than a century ago in the United Stales, infant mortality claimed more than half of the newborn within the first year of life. Medical advances, however, have now reduced that rate to nearly zero. A child born in the United States today has better than a 90% chance of survival. Furthermore, medical advances have ensured that most of these infants will live to be seventy years of age or more, and even that life expectancy increases every year. The result of this progress is an enormous population increase that threatens the quality of life, brought about by progress in the medical profession.

According to this passage, " progress" doesn't always mean that______.

A．something has become stronger and better

B．something has been changed from being one thing to another

C．something has become funny

D．something turns out to be worse than before

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第10题

Most cities and/or states in the U. S. collect a sales tax on almost everything you buy. Y

ou must ask when you move into a new community how much the local sales tax is, and what items are and are not taxable. Both taxable items and the amount of tax vary considerably from place, from one of two percent in some places up to eight or ten in others. The New York City sales tax, for examples, is currently 8% , so if you buy a pair of $40 shoes you will actually have to pay $43.20. This makes paying and getting correct change much more difficult (not to mention making .everything more expensive). We say in America that only two things in life are unavoidable: one is death and the other taxes.

Another thing that makes money exchanges more complicated is tipping. The Chinese people have happily put an end to tipping, but Westerners are still plagued with this indignity. Waiters and waitresses, cab drivers, hotel bellboys, barbers and hairdressers and all sorts of other people must be tipped. Their employers give them low wages because it is expected that you, the customer, will make up the difference. If you don' t, the service person can' t earn a living. Tipping also varies from place to place, generally in the area of 15% of your bill (before taxes), but again you should ask local residents whom to tip and how much.

There is another kind of tipping as well. You are generally expected to give something (either cash or a bottle of whisky) to the mailman and to your building "super" at Christmas time. You should discuss this also with neighbors and colleagues.

The main idea of this passage is ______.

A．shopping and tipping

B．sales and shopping

C．sales taxes and tipping

D．sales taxes and people

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第11题

What makes one person more intelligent than another？ What makes one person a genius, like

the brilliant Albert Einstein, and another person a fool？ Are people born intelligent or stupid, or is intelligence the result of where and how you live？ These are very old question and the answers to them are still not clear.

We know, however, that just being born with a good mind is not enough. In some ways, the mind is like a leg or an arm muscle. It needs exercise. Mental (done with the mind) exercise is particularly important for young children. (78) Many child psychologists (心理学家) think that parents should play with their children more often and give them problems to think about. (79)The children are then more likely to grow up bright and intelligent. If, on the other hand, children are left alone a great deal with nothing to do, they are more likely to become dull and unintelligent.

Parents should also be careful what they say to young children. According to some psychologists, if parents are always telling a child that he or she is a fool or an idiot, then the child is more likely to keep doing silly and foolish things. So it is probably better for parents to say very positive (helpful) things to their children, such as "That was a very clever thing you did." or" You are such a smart child."

The words "intelligent" and "brilliant" in the first paragraph probably mean ______ while "dull" in the second paragraph means ______.

A．bright and splendid... slow in thinking and understanding

B．pretty and handsome... ordinary - looking

C．great and important... common

D．hopeful and helpful... careless

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