Sleep and dreams have interested people for centuries. Scientists are learning more about sleep, but they still know very little about why we dream.

    {#blank#}1{#/blank#} 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 can't remember doing so when we awake. {#blank#}2{#/blank#} While we are asleep, it works more slowly and sometimes puts our thoughts and memories together in strange ways.

{#blank#}3{#/blank#} Some believe that our dreams are relevant to thoughts and feelings that we experience while we are awake. Many dreams researchers think that a dream about death, for example, is really about an important life change. {#blank#}4{#/blank#} A dream about teeth—especially broken or loose ones-may suggest stress or 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, for example, maybe you are angry. {#blank#}5{#/blank#}

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 scared then maybe you are terrified of something.

    D. Modern research can tell us some important things about dreams.

    E. There are three things you should pay attention to have a sweet dream.

    F. Finally, a part of our brain helps us to understand daily experience we have.

    G. Dreams about telephones are thought to be about giving or receiving messages.

    Women are friendly．But men are more competitive．Why? Researchers have found it's all down to the hormone oxytocin （荷尔蒙催生素）．Although known as the love hormone, it affects the sexes differently．

"Women tend to be social in their behavior．They often share with others．But men lend to be competitive．They are trying to improve their social status," said Professor Ryan．

    Generally, people believe that the hormone oxytocin is let out in our body in various social situations and our body creates a large amount of it during positive social interactions （互动） such as falling in love or giving birth．

But in a previous experiment Professor Ryan found that the hormone is also let out in our body during negative social interactions such as envy．

    Further researches showed that in men the hormone oxytocin improves the ability to recognize competitive relationships, but in women it raises the ability to recognize friendship．

Professor Ryan's recent experiment used 62 men and women aged 20 to 37．Half of the participants（参与者）received oxytocin．The other half received placebo （安慰剂）．

    After a week, the two groups switched with participants．They went through the same procedure with the other material．

    Following each treatment, they were shown some video pictures with different social interactions．Then they were asked to analyze the relationships by answering some questions．The questions were about telling friendship from competition．And their answers should be based on gestures, body language and facial expressions．

    The results indicated that, after treatment with oxytocin, men's ability to correctly recognize competitive relationships improved, but in women it was the ability to correctly recognize friendship that got better．

    Professor Ryan thus concluded: "Our experiment proves that the hormone oxytocin can raise people's abilities to better distinguish different social interactions．And the behavior differences between men and women are caused by biological factors （因素） that are mainly hormonal．"

    Of all the things we eat and drink, water is the most important. Not all people realize this, but it is quite true. The human body can live without food for a long time, but two or three days without water usually result in death.

    Many people do not understand how much water the human body needs, but many people do not drink enough, especially in the hot weather. Most people drink when they are thirsty but often need more water after exercises.

    65 to 70 percent of the human body is water. Water is important in several different ways. Most people need five to seven litres of water every day, but we need not drink this amount because a lot comes from the food we have. If we don't have enough water, however, we will feel tired and many become ill. Do you know what the best drink is? Yes, you are right. Cold water!

    The most successful people all have certain habits in their daily routines. These habits help contribute to their success. Forming a new good habit can be a struggle, but it is well worth the effort. {#blank#}1{#/blank#}

    Set your goal. Before you can begin to work on your new habit, figure out exactly what you hope to accomplish. {#blank#}2{#/blank#} Make sure that your goal is specific, measurable and realistic to increase your chances of success.

    {#blank#}3{#/blank#} Choosing the habits that are most likely to help you achieve your goal is important. After you have set your goal and worked out all the specifics of achieving that goal, identify a habit that is part of achieving that goal. Consider what good habit would help you accomplish that goal.

    Consider your motivation. Once you have identified your goal and the new habit you need to accomplish this goal, take some time to consider your motivation. {#blank#}4{#/blank#} Good motivation can be the difference between success and failure in terms of forming a new habit. So take your time to consider your motivation.

    Give yourself time. Forming a new habit can take a long time. Some people can form a new habit in as little as a few weeks, while other people will take several months. As you work to form your new habit, just keep in mind that it may be a while before it comes true. {#blank#}5{#/blank#}

A. Identify ways to achieve goals.

B. Find the habit you want to form.

C. Good habits are sure to make you a success.

D. Here are the four steps you can follow to form good habits.

E. It is worthwhile to consider your goal.

F. Try to be patient with yourself as you form your new habit.

G. Your motivation is the reason you want to form this new habit.

    Why are people interested in eating raw foods or whole foods? One reason is that eating these types of food reduces the risk of acid accumulation in your body.

    Raw and whole foods are usually digested more efficiently than cooked and refined foods. When we cook foods, we destroy the natural enzymes (酶) that are part of the food in its raw form. These enzymes were intended by nature to help us digest the food. When we consume food without these natural enzymes, our bodies either digest the food improperly or allow too many nutrients to be absorbed into the bloodstream. In both instances, the result is obesity. When too many nutrients are absorbed at once, the body grows fat. Improperly digested food moves slowly through the digestive tract, where it becomes increasingly acidic. To protect its vital organs from this acidic waste, the body changes the acid into fat and stores it safely away from the organs.

    Processed foods contain chemical elements, which might confuse the appetite mechanism that tells us when we've had enough to eat; as a result, people often overeat. Processed foods also upset the digestive cycle. The body will either identify these foods as allergens and then store them safely away from the organs as fat, or the remains of undigested food will become acidic and enter the bloodstream as acid waste, which will stick to the blood vessel walls and block the passage of vital oxygen and nutrients heading for the body's cells. The body's metabolism (新陈代谢) becomes inactive, and the result is weight gain and obesity.

    The accumulation of acid in the digestive tract makes digestion increasingly inefficient. When that happens, even healthy foods can become acidic and the food allergies will become more common.

    To stop this vicious circle in its tracks, people need to consume food and supplements that will neutralize the acid already accumulated in body. Eating the right types of raw and whole foods can help. It's also important to restore your enzyme balance. You need to identify and avoid the foods that cause acid accumulation and consume the foods that increase enzyme production. If you truly want to change and help your body heal itself, you need to take an active approach.

The "Great Green Wall of China" project is over forty years old. In this project, people plant trees in {#blank#}1{#/blank#} part of China. Why are trees so important to us?

Because it is healthy to live around trees. They can keep us {#blank#}2{#/blank#}, just like doctors. So we call them "doctor trees".

Trees can clean the air. For people in large cities {#blank#}3{#/blank#} air pollution, trees can be very important. Workers are {#blank#}4{#/blank#} trees not just in city parks {#blank#}5{#/blank#} also along streets to help clean the air.

Some {#blank#}6{#/blank#} think that trees not just help clean the air. They are also good for our health. A study {#blank#}7{#/blank#} that people in hospitals feel better when {#blank#}8{#/blank#} trees from their rooms. And people with trees near their homes usually exercise more.

Scientists are also studying the healthy effects (作用) of trees on human minds. One effect of trees is that they make people feel happy and {#blank#}9{#/blank#}. When people go through the neighborhood with more trees, they will walk slower and talk {#blank#}10{#/blank#} often with each other.

Of course, another good effect is that "doctor trees" work for free! Writing 3