Trees are useful to man in three important ways.
The first important way is that they provide(提供) man with food, wood and the other products. Trees provide not only man with food, but also many animals with food. Without trees many animals could not live on the earth. It’s not easy for man to live on the earth, either.
The second important way is that trees give us shade(阴凉). On a hot summer day, people are eager(渴望) to have a rest under the tree after they have a long walk. You can imagine how important the shade of a tree is to man and animals.
The third important way is that trees help to prevent droughts and floods(防止干旱和洪水). However, in many parts of the world, man hasn’t realized the third way. They were cutting trees down in large numbers. In the end they find that they have lost the best friends they had.
根据短文内容，回答下列问题。
【小题1】 How many important ways are trees useful to man?
____________________________________________
【小题2】 Trees only provide man with food, don’t they?
____________________________________________
【小题3】 On a hot summer day, what do trees give us?
____________________________________________
【小题4】 What does the underlined word “they” means？
____________________________________________
【小题5】 What’s the best title of the passage?
____________________________________________
【小题1】 Three ways.
【小题2】 No, they don’t.
【小题3】 They give us shade in a hot summer.
【小题4】 It means “man”
【小题5】 The Importance of the Trees.Hydration: Why It’s So Important
&&&&&&&&&&&&Hydration: Why It&s So Important
Hydration: Why It’s So Important
Related Articles
Why is it so important to stay hydrated?
Your body depends on water to survive. Every cell, tissue, and organ in your body needs water to work correctly. For example, your body uses water to maintain its temperature, remove waste, and lubricate joints. Water is needed for good health.
How does my body lose water?
Water makes up more than half of your body weight. You lose water each day when you go to the bathroom, sweat, and even when you breathe. You lose water even faster when the weather is really hot, when you are physically active, or if you have a fever. Vomiting and diarrhea can also lead to rapid water loss. If you don’t replace the water you lose, you can become dehydrated.
How do I know if I’m dehydrated?
Symptoms of dehydration include the following:
Little or no urine, or urine that is darker than usual
Sleepiness or fatigue
Extreme thirst
Dizziness or lightheaded feeling
No tears when crying
Don’t wait until you notice symptoms of dehydration to take action. Actively prevent dehydration by drinking plenty of water.
Who is at higher risk of dehydration?
People are at higher risk of dehydration if they exercise at a high intensity, have certain medical conditions, are sick, or are not able to get enough fluids during the day. Older adults are also at higher risk. As you get older, your brain may not be able to sense dehydration and send the signals for thirst.
You may need to increase the amount of water you are drinking if you:
Have certain medical conditions, such as
Will be outside during hot weather
Have a fever
Have been vomiting or have diarrhea
How much water should I drink each day?
You may have heard different recommendations for daily water intake. Most people have been told they should drink 6 to 8 8-ounce glasses of water each day, which is a reasonable goal. However, different people need different amounts of water to stay hydrated. Most healthy people can stay well hydrated by drinking water and other fluids whenever they feel thirsty. For some people, fewer than 8 glasses may be enough. Other people may need more than 8 glasses each day.
If you are concerned that you are not drinking enough water, check your urine. If your urine is consistently colorless or light yellow, you are most likely staying well hydrated. Dark yellow or amber-colored urine is a sign of dehydration.
Besides water, what else can I consume to stay hydrated?
Water is the best option for staying hydrated. Other drinks and foods can help you stay hydrated, but some may add extra calories from sugar to your diet.
Drinks like fruit and vegetable juices, milk, and herbal teas can contribute to the amount of water you get each day. Even caffeinated drinks (for example, coffee, tea, and soda) can contribute to your daily water intake. A moderate amount of caffeine (200 to 300 milligrams) is not harmful for most people. This is about the amount in 2 to 4 8-ounce cups of coffee. However, it’s best to limit caffeinated drinks because caffeine may cause some people to urinate more frequently, or feel anxious or jittery.
Water can also be found in fruits and vegetables (for example, watermelon, tomatoes, and lettuce) and in soup broths.
What about sports drinks and energy drinks?
For most people, water is all that is needed to maintain good hydration. However, if you are planning on exercising at a high intensity for longer than an hour, a sports drink may be helpful. It contains carbohydrates and electrolytes that can increase your energy and help your body absorb water.
Choose a sports drink wisely. They are often high in calories from
and may contain high levels of sodium. Also, check the serving size. One bottle may contain several servings. If you drink the entire bottle, you may need to double or triple the amounts given on the . Some sports drinks contain caffeine. If you use a sports drink that contains caffeine, be careful not to get too much caffeine in your diet.
Sports drinks are not the same as energy drinks. Energy drinks usually contain large amounts of caffeine and other stimulants (for example, guarana, ginseng, or taurine) that your body doesn't need. Most of these drinks are also high in added sugar. Many experts recommend that children and teens should not have energy drinks.
Tips for staying hydrated
Keep a bottle of water with you during the day. Purchasing bottled water is expensive and creates plastic bottle waste. Carry a reusable water bottle and fill it from the tap instead.
If you don’t like the taste of plain water, try adding a slice of lemon or lime to your drink.
Be sure to drink water before, during, and after a workout.
When you’re feeling hungry, drink water. Thirst is often confused with hunger. True hunger will not be satisfied by drinking water. Drinking water may also contribute to a healthy weight-loss plan. Some research suggests that drinking water can help you feel full.
If you have trouble remembering to drink water, drink on a schedule. For example, drink wa at breakfast, lunch, and when you go to bed. Or drink a small glass of water at the beginning of each hour.
Drink water when you go to a restaurant. It will keep you hydrated, and it’s free!
This content was developed with general underwriting support from The Coca-Cola Company.
Written by familydoctor.org editorial staff
Reviewed/Updated: 03/15
Created: 01/10
Financial support provided by:
Follow FamilyDoctor.org
This site complies with the
information: .&&& Different people have different ideas about time.
&&& People in the USA think that it is& 1&to know the time. In American cities, there are& 2&in stations, factories and other buildings. Radio announcers(播音员) give you the correct time during the day. Most Americans also have watches with them& 3&they go. They want to do certain( 一定的) things& 4 a certain time. They don't like to be late.They think everyone is supposed to do 5 on time.
　　But time is not&6 important to everybody in the world. When you visit a country in South America, you will&7 that people there don't like to rush. (匆忙行事)If you have an appointment(约会) with somebody, he can probably be late &8 &he may not want to arrive on time. examda
&&& In South America, even radio programs may not begin on time. The men on the radio may not think it is important to tell the exact 9. People in South America think that clocks or watches are just machines. They think that you will&10 a clock or a watch control(控制) your life&if you do everything on time.
1.A.helpful& B.useless& C.important& D.easier
2.A.clocks& B.cars& C.books& D.watches
3.A.whenever& B.however& C.whatever& D.wherever
4.A.at& B.on& C.for& D.in
5.A.nothing& B.everything& C.something& else& D.some things
6.A.such& B.as& C.so& D.only
7.A.understand& B.find& C.forget& D.remember
8.A.while& B.but& C.though& D.because
9.A.time& B.place& C.weather& D.news
10.A.put& B.want& C.let& D.expect
1-5 C A D A B
6-10 C B D A CYou are very selfish.it is high time 用法You are very selfish.It’s high time you ________ that you are not the most important person in the world,” Edgar said to his boss angrily.A.realizedB.have realizedC.has realizedD.should realize选A而不选D的理由是什么?It's high time不是要用虚拟语气吗?
uxEI33QX67
是的呢,使用虚拟语气,是对现在的虚拟而不是过去或者将来,就用动词过去式咯.
为您推荐：
其他类似问题
选A，因为It's high time要用虚拟语气，有两种，一个是过去式，一个是should 加动词原形。我们经常用过去式，所以选A。
扫描下载二维码GET UPDATES BY EMAIL
Enter your email below to get exclusive access to our best articles and tips before everybody else.
You’ve probably heard that it’s important to use your display’s native resolution – assuming you’re using an LCD flat-panel monitor instead of an ancient CRT monitor. With a LCD, using a lower resolution will result in inferior image quality.
Windows generally defaults to your monitor’s native resolution, but many PC games will often default to lower resolutions.
Image Credit:
Effects of Using a Non-Native Resolution
You can see the effects of using a non-native resolution yourself if you’re using an LCD monitor. Right-click your desktop and select Screen resolution. From the window that appears, click the Resolution box and select a resolution other than the one recommended for your monitor (this is your monitor’s native resolution).
After selecting a lower resolution, you’ll see its results. Fonts and images will be blurry and everything will generally look lower-quality and less-sharp. This is very different from how a CRT (cathode ray tube) monitor worked. With an old CRT monitor, you wouldn’t see worse image quality when using a lower resolution.
LCD vs. CRT
In a CRT, an electron gun shoots a stream of electrons that is filtered to become the image that appears on your screen. The exact details behind how a CRT monitors work is beyond the scope of this article, but the important point is that a CRT monitor can display an image at any resolution at or below its maximum resolution. When an 800×600 signal is sent the the monitor, it produces an 800×600 image that takes up the full area of the screen.
Image Credit:
Unlike a CRT monitor, a modern LCD display contains a certain number of individual pixels. Think of each pixel as a small light that can be one of several colors (it actually produces a color through a combination of its red, green and blue elements). The image on your screen is built from the combination of these pixels. The number of pixels in an LCD results in its native resolution – for example, a laptop with a 8 resolution has 8 pixels.
Image Credit:
When an LCD monitor runs in its native resolution – 8 in the example above — each pixel on the LCD corresponds to a pixel in the image sent by your computer’s video card. This produces a sharp, clear image.
What Happens When You Use a Non-Native Resolution
Now, imagine that your computer’s video card sends an 800×600 image to a 8 LCD — you’ll see that the 800×600 image doesn’t evenly correspond to the number of pixels in the LCD. To produce an image smaller than its native resolution, the display would still be using 8 pixels – so the display must interpolate (scale) the image to be larger and fill the screen. In the example here, the aspect ratios (4:3 for 800×600 and 16:9 for 8) are different – so not only will the image be enlarged, the image will be distorted.
This is similar to enlarging an image in an image-editing program – you’ll lose clarity and, if the image is a different aspect ratio, it will appear distorted. For example, here I’ve taken a screenshot of How-To Geek at 800×600 and enlarged it to 8 (I then shrunk it, maintaining the aspect ratio, so it would fit this article.) As you can see, the image is blurry from being enlarged and distorted from being widened. This is what your LCD does when you use a non-native resolution.
When playing games on an LCD, bear in mind that using your native resolution is important for graphics quality – although other settings may be more important, as producing a larger image takes more graphics horsepower.
If you want fonts and other elements on your screen to be larger and easier to read, you should try adjusting the size of the elements in your operating system rather than changing your monitor’s resolution.
Published 07/16/12
GET ARTICLES BY EMAIL
Enter your email address to get our daily newsletter.
Disclaimer: Most of the pages on the internet include affiliate links, including some on this site.
Get exclusive articles before everybody else.
Get downloadable ebooks for free!
Get geeky trivia, fun facts, and much more.
Enter Your Email Here to Get Access for Free:
Go check your email!}