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The Drink Your Body Needs Most
（1） Our bodies are estimated to be about 60% to 70% water. Blood is mostly water， and our muscles， lungs， and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients （滋养物） to travel to all our organs. Water also transports oxygen to our cells， removes waste， and protects our joints and organs.
（2） We lose water through urination （排尿）， respiration （呼吸 ）， and by sweating. If you are very active， you lose more water than if you do not take much exercise. Symptoms of mild dehydration （脱水） include chronic pains in joints and muscles， lower back pain， headaches，and constipation （便秘）. A strong smell to your urine， along with a yellow color indicates that you are not getting enough water. Thirst is all obvious sign of dehydration and in fact， you need water long before you feel thirsty.
（3） A good rule of thumb （好的做法） is to take your body weight in pounds and divide that number in half. That gives you the number of ounces （盎司） of water per day that you need.
For example， if you weigh 160 pounds， you should drink at least 80 ounces of water per day.
If you exercise you should drink another 8ounce glass of water for every 20 minutes you are active. If you drink coffee or alcohol， you should add at least an equal amount of water. When you are traveling on an airplane， it is good to have 8 ounces of water for every hour you are on board the plane.
（4） It may be difficult to drink enough water on a busy day. Be sure you have water handy at all times by keeping a bottle for water with you when you are working， traveling， or exercising. If you get bored with plain water， add a bit of lemon for a touch of flavor. There are some brands of flavored water available， but some of them have sugar or artificial sweeteners that you don"t need.
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The Issue of Package
Maybe everyone has such an experience that you have to unwrap several layers of packaging when you enjoy a piece of candy. But this overuse of wrapping is not confined to luxuries. It is becoming increasingly difficult to buy anything that is not done up in beautiful wrapping.
The package itself is of no interest to the shopper， who usually throws it away immediately. So why is it done？ Some of it， like the cellophane on meat， is necessary， but most of the rest is simply competitive selling. This is absurd. Packaging is using up scarce energy and resources and messing up the environment.
Recycling is already happening with milk bottles which are returned to the dairies， washed out，and refilled. But both glass and paper are being threatened by the growing use of plastic. More dairies are experimenting with plastic bottles.
The trouble with plastic is that it does not rot. Some environmentalists argue that the only solution to the problem of ever increasing plastic containers is to do away with plastic altogether in the shops， a suggestion unacceptable to many manufacturers who say there is no alternative to their handy plastic packs.
It is evident that more research is needed into the recovery and reuse of various materials and into the cost of collecting and recycling containers as opposed to producing new ones. Unnecessary packaging， intended to be used just once， and make things look better so more people will buy them， is clearly becoming increasingly absurd. But it is not so much a question of doing away with packaging as using it sensibly. What is needed now is a more advanced approach to using scarce resources for what is， after all， a relatively unimportant function.
"This overuse of wrapping is not confined to luxuries. " （Line 2， Paragraph 1） means __________. 查看材料
Dehydration may occur if there is a shortage of watery__________.
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Why is the Native Language Learnt So Well
How does it happen that children learn their mother tongue so well？ When we compare them with adults learning a foreign language， we often find this interesting fact. A little child without knowledge or experience often succeeds in a complete mastery of the language. A grown-up person with fully developed mental powers， in most case， may end up with a faulty and inexact command.
What accounts for this difference？
Despite other explanations， the real answer in my opinion lies partly in the child himself，partly in the behavior. of the people around him. In the first place， the time of learning the mother tongue is the most favorable of all， namely， the first years of life. A child hears it spoken from morning till night and， what is more important， always in its genuine form， with the right pronunciation， right intonation， right use of words and right structure. He drinks in all the words
and expressions， which come to him in a flash， ever-bubbling spring. There is no resistance: there is perfect assimilation.
Then the child has， as it were， private lessons all the year round， while an adult language-student has each week a limited number of hours， which he generally shares with others. The child has another advantage: he hears the language in all possible situations， always accompanied by the right kind of gestures and facial expressions. Here there is nothing unnatural， such as is often found in language lessons in schools， when one talks about ice and snow in Juneorscorching heat in January.
And what a child hears is generally what immediately interests him. Again and again， when his attempts at speech are successful， his desires are understood and fulfilled.
Finally， though a child"s "teachers" may not have been trained in language teaching， their relations with him are always close and personal. They take great pains to make their lessons easy.
Compared with adults learning a foreign language， children learn their native language with ease. 查看材料
I rarely visit my parents after I obtained a decent job in this company.
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