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.
The Meanings of Dreams
Sleep and dreams have interested people for centuries. Scientists are learning more about sleep, but they still know very little about why we dream. First, we have most of our dreams during REM (rapid eye movement) sleep. At this time, the brain is very active. Second, everyone dreams – even if we cannot remember doing so when we awaken.
While we are asleep, it works more slowly and sometimes puts our thoughts and memories together in strange ways.
Some believe that our dreams are associated with thoughts and feelings that we experience while we are awake. Many dream researchers think that a dream about death, for example, is really about an important life change.
Dreams about a car or travel often represent feelings about your own life. Dreams about teeth – especially broken or loose ones may indicate stress and fear. Dreams in which you are flying often represent freedom or escape.
Researchers think people in our dreams can tell us something about ourselves. If the person in the dream was yelling (叫喊), for example, maybe you are angry.
There is still a lot about dreaming that we do not understand. By learning more about our dreams, we may learn more about ourselves.
| A．Dreams may be more important than sleep. |
| B．Scientists do not know for certain why we dream. |
| C．If he or she was terrified, then maybe you are afraid of something. |
| D．Modern research can tell us some important things about dreams. |
E. There are three things you should pay attention to to have a sweet dream.
F. Finally, a part of our brain helps us to understand daily experiences we have.
G. Dreams about telephones are thought to be about giving or receiving an important message.
Expressions about water are almost as common as water.
The expression “to be in hot water” is one of them. It is a very old expression. “Hot water” was used five hundred years ago to mean being in trouble. One story says it got that meaning from the custom of extremely throwing hot water down on enemies attacking a castle. When we are in “hot water”, we are in trouble. A young boy can be in hot water with his mother if he comes into the house with dirty shoes.
A company seeks to keep its head above water during economic hard times. A man who loses his job tries to keep his head above water until he finds a new job.
Another common expression, “to hold water”, is about the strength or weakness of an idea or opinion that you may be arguing about. If it can hold water, it is strong and has no holes in it. If your argument can hold water, it is strong and does not have any holes.
“Throwing cold water” also is an expression that deals with ideas or proposals.For example, you want to buy a new car because the old one has some problems. But your wife “throws cold water” on the idea, because she says a new car costs too much.
| A．It means disliking an idea. |
| B．You are in a difficult situation. |
| C．A person who breaks a law can be in hot water with the police. |
| D．If it does not hold water, then it is weak and not worth debating. |
E. But many of the expressions using water have unpleasant meanings.
F. A man who has long been jobless will find it hard to make both ends meet.
G. “To keep your head above water” is a colorful expression that means staying out of debt.
Smiles and tears are part of life. But do you find enough time for laughing? I’m not asking if you experience lots of good times. Of course, we should laugh during the happy times. .
But she wrote one about a more serious subject--cancer in children. The book is titled I WANT TO GROW HAIR, I WANT TO GROW UP. Erma talks with many children who have cancer and learns important lessons from them. She learns, for example, that cancer survivors（幸存者）know how they should smile at life, though they are receivingchemotherapy（化疗）.
.Jessica’s leg was cut off at the knee because of cancer. She was learning to wear a prosthesis（假肢）. Jessica told about playing soccer. She hit the ball hard with her foot. The ball flew off in one direction while her man-made leg flew another way. Then the brave girl lay on the floor, laughing happily.
As the saying goes, “” Do you find plenty of time to laugh?
You can, if you find reasons to laugh during the difficult times. Survivors know how to laugh. If you can laugh even when you’re in trouble, you will make it. Remember, laugh and the whole world laughs with you..
| A．We just laugh about it. |
| B．Cry and you cry alone! |
| C．There’s a time to cry and a time to laugh. |
| D．Erma Bombeck is known for her funny books. |
E. But do you also laugh during the difficult times?
F. She tells about the experience of 15-year-old Jessica.
G. I still remember those happy days when we were at college.
根据短文内容，从短文后的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。
No fight can end, and no friendship can move on, until everyone says these little words: I’m sorry. Sometimes, though, they can be difficult to say..
It’s not about winning.
Friendships aren’t like the Super Bowl, and there should never be a winner and a loser. When you start fighting with a friend, it may feel important that you “win” the fight by proving you’re right and he is wrong, or by making him be the first to apologize.
You may have heard the expression “His pride stood in the way.” It is usually used to describe a person who is so determined to be“right”that he lets an opportunity for happiness pass him by forever. Remember: as time goes on, we usually forget who was right and who was wrong in a disagreement, and only remember the sadness of losing a friend.
Take the first step.
Are you sick of fighting? Do you think this fight is just not important enough to ruin your friendship? You don’t have to take full responsibility for starting the fight, or even say that your feelings were wrong. But you should find something you did or said that’s worth apologizing for. Maybe you’re sorry that you let the fight go for so long, of that you overreacted(反应过度的) to something your friend did. If you say you are sorry, it’s like an invitation for your friend to do the same.
| A．Then try to be the first to apologize. |
| B．Stop thinking about your pride. |
| C．It’s about taking some responsibility for the argument. |
| D．Don’t let this happen to a friendship you care about. |
E.Here are some things to keep in mind.
F.There are some special cases when you shouldn’t be the one to apologize first.
G.Once you’ve both said it, you’ll both feel a million times better.
How to Make Friends
Friendship is a very important human relationship and everyone needs good friends. Good friendship has many benefits.It offers companionship, improves self-worth and promotes good health.There are times in our lives such as when we have recently moved into a new town, or changed our jobs or schools.Such changes often leave us without a friend. .But for many of us the process is difficult and requires courage.Below are some helpful suggestions on how to make and keep friends.
1.Associate with others.
The first step to making friends is associating with other people. You can go to public places to meet new people.Besides, you will need to make yourself known by becoming an active member of such places.
2.Start a conversation.
Starting a conversation is the second most important step in making new friends. . You can always start the conversation.Being able to make small talk is a very useful skill in relating with other people.
3. .
Choosing friends with common interests is important in building friendship as these interests would always bring you and your friend together. Hanging out will always be a pleasant experience.
4.Let it grow.
It is a good thing to stay in touch.However, try not to press your new friend with calls, messages or visits as this would likely wear him or her out and finally you may lose your friend.. The best friendships are the ones that grow naturally.
5.Enjoy your friendship.
The best way to enjoy your friendship is to allow your friends to be themselves. . Try not to change them from who they are to what you want them to be.Become the kind of friend you will want your friend to be to you.
| A．Be cheerful. |
| B．Do things together. |
| C．Do not wait to be spoken to |
| D．Try not to find fault with your friends. |
E. Making new friends comes easy for some people.
F. For a friendship to develop you need to stay in touch.
G. So you will need to give your friend time to react to you.