根据短文内容，从下边的A—F选项中选出能概括每一段主题的最佳选项。选项中有一项为多余选项。
A . The different structure of blue holes.
B. Why scientists are interested in blue holes.
C. How a blue hole comes into being.
D. Blue holes exploring is becoming popular.
E. Rules to obey when diving into blue holes.
F. The general definition of a blue hole.______________
A blue hole is a flooded sea cave with a hole that opens up at the land's surface. These cave systems form in carbonate rock, often on islands. Some blue holes have very special rock formations and water chemistry. Far below sea level, they contain some of the harshest environments on Earth, with no oxygen and no light. Yet these areas are filled with life forms that have adapted to the extreme conditions.___________
Blue holes get their name from the color some have when seen from the air. The color is usually a reflection of the sky on the water. Blue holes are the result of erosion in which water breaks down rock. Rain falling thousands of years ago contained chemicals which slowly wore away at the limestone landmass. These holes later filled with sea water as the sea level changed. The rising and falling of sea levels and the mixture of salt and fresh water further wore away at these cave formations. ____________
These flooded cave systems can be found in the ocean, or they can be found inland. Ocean caves are affected by tides, so they always have water movement. But blue holes on land are very still. They have several layers of water, chemicals, and bacteria. The top layer of fresh water comes from rainfall. This layer acts like a cap on top of the layered mixture, and keeps out oxygen from the atmosphere. The fresh water floats on a denser layer of saltwater. Underneath this is a layer of poisonous hydrogen sulfide, produced by bacteria living in the water. Underneath this layer is anoxic seawater -- water that does not contain any oxygen.___________
Information gathered from these blue holes is helping scientists to increase their understanding of biology, archaeology and geology. But exploring these blue hole environments brings danger as well as discovery. Scientists are interested in these caves because oxygen-free conditions there are similar to those on Earth long ago, before oxygen existed on our planet. But there are many difficulties involved in diving into blue holes. ___________
One reason blue holes have not been fully explored is that they can be extremely dangerous. There are many safety rules that divers must follow to help ensure their survival. First, divers must have training and experience to swim in these caves. Divers who explore a cave for the first time must establish a thin rope called a guideline. This line helps them to safely enter and exit the cave without getting lost.
根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项
为多余选项。
Good student－teacher relationships result from the choices that are made even before school, and how those choices are carried out on a daily basis. Here are a few tips to make this process easier for both parties.
___
For the teacher, this means that they need to look at each student from the perspective(角度) of what that student could learn, rather than what that student learned last week or last year. For the student, this means that they need to enter the classroom every day with the willingness to trust the teacher to help them understand. ___ Every school day there are new opportunities to learn new information or to understand subjects that might have been difficult in the past.
___
This is not to say that you have to “buy” the affections(关爱) of the student or the teacher，but you can give the gift of a smile，the gift of attention in class，or the gift of eye contact. Giving this type of gift always helps to build strong relationships.
Demand the best.
____ We can trust friends to keep us responsible and when developing good student－teacher relationships，the same principle of trust applies. Setting high expectations always pushes us to be our best，and when both the student and the teacher are pushing the other for more depth, more wisdom, more insight, etc，then both the student and the teacher will give more.
To develop a good student－teacher relationship，both the student and the teacher must be willing to decide to do these things daily. Each day，they must be willing to try again and work on the relationship. ___
| A．Buy gifts for teachers. |
| B．Give gifts to one another. |
| C．Focus on the positive. |
| D．We can always learn a lot from our teachers. |
E．Future learning is never limited by past experiences.
F. Good relationships are always founded on honesty and high expectations.
G．The most important thing is to trust the relationship to benefit each of the members.
根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
If you’re familiar with the story of the hare (野兔) and the tortoise（乌龟）, you know that the tortoise proved that perseverance is much more important than speed. , but fewer people have the patience and perseverance of the tortoise. Here are some tips that can help you to improve your perseverance.
●Set goals and write them down.
If you don’t know what you want to accomplish, it’s hard to persevere(坚持) until you do. instead of making many projects that may upset you
● , and cross each step off the list as you complete it.
If you want to master the ability to cook German dishes, you’ll need to read cookbooks, study the recipes（食谱）, buy ingredients（食料） and practice making the dishes. Write down all these steps and remove each step as you go.
●Make a list of the rewards related to any project to encourage yourself to persevere.
When you want to lose 40 pounds, it may seem like a difficult goal. . You can lower yourblood sugar or fit into your favorite pair of jeans（牛仔裤）. Keep those rewards in mind to encourage yourself to stick to your diet and exercise program.
●Imagine your success.
Take time each day to sit back, relax and picture the life you’ll lead once you’ve reached your goal. Read them over several times a day to encourage yourself to keep going.
| A．Like the hare, many people start off strong |
| B．Or you can write out a paragraph or two about how reaching your goal will change your life |
| C．You can’t lose weight only by going on a diet |
| D．Make a list of the steps needed to reach your goal |
E. But there are big rewards for doing so
F. Choose one or two goals that are most important to you and work toward those
根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Why Exercise is Cool?
1. Exercise Strengthens Muscles
Did you ever do a push-up or swing across the monkey bars at the playground? By using your muscles to do powerful things, you can make them stronger. For older teens and adults, this kind of workout can make muscles bigger, too.
2.
Can you touch your toes easily without yelling ouch? Most kids are pretty flexible, which means that they can bend and stretch their bodies without much trouble. Being flexible is having “full range of motion,” which means you can move your arms and legs freely without feeling tightness or pain.
3. Exercise Keeps the Balance Your body needs a certain amount of calories every day just to function, breathe, walk around, and do all the basic stuff.
If you’re not very active, your body won’t need as many calories.
Whatever your calorie need is, if you eat enough to meet that need, your body weight will stay about the same. If you eat more calories than your body needs, it may be stored as extra fat.
4. Exercise Makes You Feel Good
It feels good to have a strong, flexible body that can do all the activities you enjoy — like running, jumping, and playing with your friends. It’s also fun to be good at something, like scoring a basket, hitting a home run, or perfecting a dive.
But you may not know that exercising can actually put you in a better mood. It’s just another reason why exercise is cool!
| A．So you want to do some aerobic (有氧的) exercise right now? |
| B．Food gives your body fuel in the form of calories, which are a kind of energy. |
| C．When you exercise, your brain releases a chemical, which may make you feel happier. |
| D．Those are exercises that can build strength. |
E. Exercise Makes You Flexible
F. Exercise Makes Your Heart Happy
G. But if you’re active, your body needs an extra measure of calories or energy
根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项
为多余选项。
All over the world people enjoy sports. Sports help to keep people healthy and happy, and to live longer. They buy tickets or turn on their TVs to watch the games. Often they get very excited when their player or team wins.
Football, for example, has spread around the world. Swimming is popular in all countries near the sea or in those with many rivers. What fun it is to jump into a pool or lake, whether in China, Egypt or Italy!
Think how many lovers to skate or ski in Japan, Norway or Canada.
Some sports or game go back thousands of years, like running or jumping. Chinese wushu, for example, has a very long history. But basketball and volleyball are rather new. Neither one is a hundred years old yet. Water-skiing is one of the newest in the family of sports.
People from different countries may not be able to understand each other, but after a game together they often become good friends. One learns to fight hard but fight fair, to win without pride and to lose with grace.
| A．And think of people in cold countries. |
| B．Sports help to train a person’s character. |
| C．Not a few people participate in different sports competitions themselves. |
| D．Many people like to watch others play games. |
E. People aren’t inventing new sports or games.
F. Some sports are so interesting that people everywhere take part in them.
G. People are inventing new sports or games all the time.
根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Tips for Cooking on a Tight Schedule
From my experience , there are three main reasons why people don’t cook more often :ability , money , and time .Money is a topic I’ll save for another day .So today I want to give you some wisdom about how to make the most of the time you spent in the kitchen .Here are three tips for great cooking on a tight schedule :
Think ahead .The moments when I think cooking is a pain are when I’m already hungry and there’s nothing ready to eat .So think ahead of the coming week .When will you have time to cook ?Do you have the right materials already ? .
Make your time worth it .When you do find time to cook a meal , make the most of it and save yourself time later on .Are you making one loaf of bread ? .It takes around the same amount of time to make more of something .So save yourself the effort for future meal .
This may surprise you , but one of the best tools for making cooking worth your time is experimentation .It gives you the chance to hit upon new ideas and recipes that can work well with your appetite and schedule. The more you learn and the more you try, the more ability you have to take control of your food and your schedule.
Hopefully that gives you a good start. _______ And don’t let a busy schedule discourage you from making some great changes in the way you eat and live!
| A．Try new things. |
| B．Ability is easily improved. |
| C．Make three or four instead. |
| D．Understand your food better. |
E. Cooking is a burden for many people.
F. Let cooking and living simply be a joy rather than a burden.
G. A little time planning ahead can save a lot of work later on.