题目内容
If you’re training for a marathon , a proper plan for water intake (摄入) is important . Of course , there’s the risk of dehydration (脱水) . But athletes now know they can also get into trouble by drinking too much. Too much water intake can lower levels of sodium (钠) in the blood . The death of a 28-year-old woman following the Boston Marathon caught the attention of many runners and led to new research.
Experts advise long distance runners to replace the liquids they sweat out. Their goal is to try to keep someone from not getting dehydrated by more than 2 percent of their body weight.
One technique for deciding how much water you need is to get the exact numbers. Runners have to weigh themselves before and after a run to determine how much water they’ve lost. If their weight drops by more than 2 percent, they have not drunk enough water.
Hyponatremia occurs when runners drink so much water that blood salt levels drop off. A study published last year tested 488 runners who completed the Boston Marathon and found 13 percent of them had dangerously low blood salt levels. The first sign that runners may notice is slightly swelling in the hands. They can’t get their rings off, and then they might feel sick. They may not remember where they are. In fact, most runners get enough salt to get back to normal levels by eating just one meal after a run. Contrary to the old advice that runners should drink as much as they can to prevent dehydration , the new research has shown that the body is a remarkable machine that actually tells you via thirst when you need water .
1．The author of this passage is primarily concerned with .
A．the signs and treatment for dehydration
B．the long distance runners who need help
C．how to manage water intake during a marathon
D．a 28-year-old woman who died after a Boston Marathon
2．Why do runners have to weigh themselves before and after a run?
A．They can improve their performance in a run.
B．They can learn how much salt there is in the blood.
C．They ca know the quantity of water they’ve lost during a run.
D．They can decide what kind of water they should take during a run.
3．What conclusion can we draw from the passage?
A．Taking much salt during a run can avoid swelling in the body.
B．Either too much or to little of water intake is harmful.
C．A rich meal is helpful to our performance in a run.
D．We should take enough salt during a run.
4．According the passage, which of the following statements is correct?
A．Too much water intake→blood sodium levels ↓→dehydration.
B．Too much water intake→blood salt levels ↓→hyponatremia.
C．No water intake→blood sodium levels↑→hyponatremia.
D．No water intake →blood salt levels ↓→hyponatrenmia.
CCBB
Here are six steps to better studying.
Pay attention in class
Do you have trouble paying attention in class? Are you sitting next to a loud person? Tell your teacher or parents about any problem that is preventing you from paying attention.
Take good notes
Write down facts that your teacher mentions or writes on the board. Try to use good handwriting so you can read your notes later. It’s a good idea to keep your notes organized by subject.
Plan ahead for tests and projects
Waiting until Thursday night to study for Friday’s test will make it hard to do your best. One of the best ways to make sure that doesn’t happen is to plan ahead. Write down your test dates. You can then plan how much to do after school each day, and how much time to spend on each topic.
Break it up
When there’s a lot to study, it can help to break things into several parts. Let’s say you have a spelling test on 20 words. Instead of thinking about all of the words at once, try breaking them down into five-word groups and work on one or two different groups each night.
Ask for help
You can’t study effectively if you don’t understand the material. Be sure to ask your teacher for help. If you’re at home when the confusion occurs, your morn or dad might be able to help.
Sleep tight
So the test is tomorrow and you’ve followed your study plan—but suddenly you can’t remember anything! Don’t panic. Your brain needs time to digest all the information you’ve given it. Try to get a good night’s sleep and you’ll be surprised by what comes back to you in the morning.
1.We know from the passage that a loud person is .
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A．a student who always answers questions loudly in class |
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B．someone who likes to talk with others in a loud voice |
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C．a student who likes speaking with others in class |
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D．a person who makes a lot of noise in public places |
2.According to the author, which of the following is an effective studying method?
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A．Don’t try to review everything you have learned in one go. |
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B．Try to review what you’ve learned in one go. |
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C．To read all your notes the night before the test. |
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D．Try to remember everything on the first try. |
3.If you don’t understand what you have learnt, you can .
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A．read your notes over and over again |
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B．turn to people around you for help |
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C．put aside the material for later review |
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D．ask your teacher to explain it the next day |
4.By saying “Sleep tight”, what does the author mean?
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A．Sleep again after waking up. |
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B．Sleep holding your breath deep. |
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C．Get a good night’s sleep. |
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D．Go to sleep early every night. |
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Thinline Digital TV: This TV provides the crystal clear picture you expect from
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a button. Cost: $3,500Most people, when they travel to space, would like to stay in orbit for a few days of more. And this stands to reason, if you’re paying $20,000 for your trip to orbit! Strain order for tourism to reach its full potential there’s going to be a need for orbital accommodation---or space hotels. What would a space hotel actually be like to visit? Hotels in orbit will offer the services you expect from a hotel------private rooms, meals, bars. But they’ll also offer two unique experiences: impressive views----of Earth and space---and the endless entertainment of living in zero gravity---including sports and other activities that make use of this.
The hotels themselves will vary greatly----from being quite simple in the early days to huge luxury structure at a later date. It’s actually surprising that as later as 1997, very few designs for space hotels were published. This is mainly because those who might be expected to design them haven’t expected launch costs to come down far enough to make them possible.
Lots of people who’ve been to space have described vividly what it’s like to live in zero gravity. There are obviously all sort of possibilities for dancing, gymnastics, and zero-G sports. Luckily, you don’t need to sleep much living in zero gravity, so you’ll have plenty of time for relaxing by hanging out in a bar with a window looking down at the turning Earth below.
Of course all good things have come to an end. Unfortunately, And so after a few days you’ll find yourself heading back enough you’ll be much more expert at exercising in zero gravity than you were when you arrived. You’ll be thinking how soon you can save up enough to get back up again---or maybe you should change jobs to get to work in an orbiting hotel.
1.When traveling in space, most people would like to stay in orbit for a few days because _______.
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A．It is expensive to travel in space |
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B．they would find the possible life in other star systems |
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C．they could enjoy the luxury of space hotels |
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D．they want to realise the full potential of tourism |
2.Which of the following is a unique experience that space hotels will offer?
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A．The gravitational pull |
B．The special views. |
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C．The relaxation in a bar |
D．The space walk. |
3.Which of the following is not discussed in the passage?
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A．When was the space traveling made possible? |
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B．What are the unique experiences that space hotels will offer? |
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C．Why were there not many published designs for space hotels? |
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D．How can the travelers enjoy themselves in space hotels? |
4.This passage is mainly about ________.
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A．traveling in space |
B．the ways of living in space hotels |
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C．zero gravity and space hotels |
D．the description of space hotels |