Sharks are among the oldest animals on Earth. There are hundreds of kinds of sharks. Most are about two meters long. The dogfish shark, however, is less than twenty centimeters in length. A shark has an extremely good sense of smell. It can find small amounts of substances in water, such as blood, body liquids and chemicals produced by animals. {#blank#}1{#/blank#} Sharks eat fish, other sharks, and plants that live in the ocean.

    Sharks grow slowly. About forty percent of all sharks lay eggs. {#blank#}2{#/blank#} Some sharks carry their young inside their bodies as humans do. Some sharks are not able to reproduce until they are twenty years old．Most reproduce only every two years. And they give birth to fewer than ten young sharks. For this reason, over-fishing of sharks is of special danger to the future of the animal.

    Sharks are important for the world's oceans. They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too great. {#blank#}3{#/blank#} 

    People hunt sharks for sport, food, medicine and their skin. Experts say the international market for some kinds of sharks has increased because many parts of a shark are valuable. Collectors pay thousands of dollars for the jaws of a shark. {#blank#}4{#/blank#} The skin of a shark can be used like leather.  In Asia, people enjoy a kind of soup made from shark fins. Experts say a fisherman can earn a lot of money for even one kilogram of shark fins. Sharks are among the oldest animals on Earth, but some sharks are in danger of disappearing from Earth. {#blank#}5{#/blank#} 

A. Shark liver oil is a popular source of Vitamin A.

B. This protects the plants and other forms of life that exist in the oceans.

C. Sharks are valuable to us and we can make full use of them.

D. These powerful senses help sharks find their food.

E. If too many sharks in one area are killed, that group of sharks may never return to normal population levels.

F. This is a threat to other forms of life in the ocean.

G. The others give birth to live young.

    A new study suggests that the timing of a wound affects the speed at which it heals(愈合). Wounds suffered during the day heal around 60 percent faster than those at night.

    The study showed how the body's circadian rhythm(昼夜节律) controlled the healing of wounds{#blank#}1{#/blank#} It tells our bodies when to wake up, eat and sleep in a cycle—a series of activities that repeat themselves day after day{#blank#}2{#/blank#}

    In the study, researchers found that skin cells moved faster to repair wounds suffered during the day. Their findings were published in the journal Science Transnational Medicine.

    The researchers examined cells, mice, and burn injury databases{#blank#}3{#/blank#}Night-time burns—burns suffered between 8 o'clock at night and 8 o' clock the next morning—were 95percent healed after an average of 28 days.

    But after an average of 17 days, daytime burns-burns suffered between 8 o'clock in the morning and 8 o'clock at night—were 95 percent healed{#blank#}4{#/blank#}

    Wounds are very costly to treat{#blank#}5{#/blank#}In Britain's National Health Services, for example, such services cost around $6.56 billion per year. Experts say the high costs result, in part, from a lack of drugs that speed up the closure of wounds.

A. Each cycle lasts about 24 hours.

B. The circadian rhythm is like a clock or timer.

C. Specifically their investigation found the following information:

D. The new study's findings could help scientists develop better drugs.

E. In other words, nigh-time injuries took an average of 11days longer to heal

F. Worldwide, billions of dollars are spent every year on wound-treatment services.

G. That's what a group of researchers from a university in Canada recently published.

    Some people learn a second language easily. Other people have trouble learning a new language. How can you help yourself learn a new language， such as English？{#blank#}1{#/blank#}

    Be patient.

    You do not have to understand everything all at once. {#blank#}2{#/blank#} We can learn from our mistakes.

    Practice your English.

    For example, write in a journal every day. You will get used to writing in English, and you will feel com for table expressing your ideas in English. After several weeks, you will see that your writing is improving.

    {#blank#}3{#/blank#}You can practice with your classmates outside class. You will all make mistakes, but gradually you will become comfortable communicating in English.

    {#blank#}4{#/blank#}

    If you believe that you can learn, you will learn.

    Keep a record of your language learning.

    After each class, think about what you did. Did you answer a question correctly? Did you understand something the teacher explained? Perhaps the lesson was difficult, but you tried to understand it.{#blank#}5{#/blank#}

    Be positive about learning English and believe that you can do it.

    It is important to practice every day and make a record of your achievements. You will enjoy learning English, and you will have more confidence in yourself.

A. Write these achievements(成就) in your journal.

B. Besides, you must speak English every day.

C. Making mistakes is an unavoidable part in your life.

D. There are several ways to make learning English a little easier and more interesting.

E. Share your achievement with your parents and friends.

F. Feel confident(有自信心的) about learning English.

G. It is natural for you to make mistakes when you learn something new.

They Just Can't Help It

    My theory is that the female brain is mainly built for empathy — the ability to understand other people — and that the male brain is mainly built for building systems. {#blank#}1{#/blank#} For example, women are more likely to read magazines on fashion and parenting, while men will choose magazines that feature computers and sport.

    You may think that these preferences are influenced by the way people are taught to behave when they are growing up. However, this is not the case. A new study carried out at Cambridge University shows that newborn girls look longer at a face, and newborn boys look longer at a mobile. {#blank#}2{#/blank#} It has also been observed that girls are better at noticing signs of changes in other people's feelings. Boys, however, seem to enjoy building toy towers and playing with toys which have clear functions. {#blank#}3{#/blank#} People whose jobs are in the construction industries are almost male. Math and engineering, which require high levels of systems-thinking, are also male-chosen disciplines. Why do men and women have the difference? Actually women have four times as many brain neurons (神经) that connect the right and left part of their brains. Because of it, women have a better ability to multitask than men. {#blank#}4{#/blank#} Men tend to focus on a limited number of problems at a time. They will separate themselves from problems and view tasks as independent from one another.

    Some people may worry that I am suggesting one gender (性别) is better than the other, but this is not the case. My theory says that males and females differ in the kinds of things that they find easy, but that both genders have their strengths and weaknesses. {#blank#}5{#/blank#} It is not true. The study simply looks at males and females as two groups, and asks what differences exist, and why they are there.

A. Generally speaking, there are clear differences.

B. Their preference for building systems may change over time.

C. You can see the same kind of pattern in the adult workplace.

D. They will consider many sources of information at the same time.

E. It is important to stress that the female brain may be built more for empathy.

F. That suggests certain differences between male and female brains are biological.

G. Others may think the theory creates a belief of what a particular type of person is like.

    The eyes are the windows of the soul. Having a pair of bright, clear eyes is very important, so we should protect our eyes throughout our lives. {#blank#}1{#/blank#}

    Keep a distance from the TV set when you watch TV and give your eyes a rest every 30 minutes.

    {#blank#}2{#/blank#} Don't read while lying down or walking. Relax after every hour of reading.

    Don't stare at the sun or try to read in the darkness. {#blank#}3{#/blank#} This can damage your eyes easily.

    {#blank#}4{#/blank#} Not many people have this habit, but it is necessary. If you feel that there is something wrong with your eyes, get them checked quickly. Eye problem can be found and treated early with regular checks.

    Rest your eyes whenever you can. You can close your eyes for a few seconds or look into the distance for one or two minutes. A small break will relax your eyes and help to stop you from getting eye problems.

    Be careful when you choose your glasses.{#blank#}5{#/blank#} Make sure your glasses are right for you. If they don't feel right, get your glasses changed.

A. Get your eyes checked often.

B. Develop good reading habits.

C. Make sure you get enough sleep every night.

D. Even if you're wearing sunglasses, never look directly at the sun.

E. The following tips may help you to protect your eyes.

F. Drink green tea every day as a way to protect your eyes against eye problems.

G. Glasses that aren't suitable for you could bring you trouble.

    Can creativity be taught? That's a question without a simple yes or no answer. Creativity may not be able to be taught directly, but what you can get better at is frequently targeting at the circumstances of life which bring up the greatest chances for true creative expression. {#blank#}1{#/blank#}, but more like something which manifests （显现） itself inside those who learn to develop it and create the right conditions for it.

Limit your selection of tools to only the most vital. {#blank#}2{#/blank#}. You'll be sharper than someone who merely fights with a larger set of tools.

    Learn how to be resourceful. {#blank#}3{#/blank#}. Creativity is not just about creating something new but making old things work better as well. Think of crazy possibilities as well as practical ones. You might find inspiration for a workable solution in one of your ideas.

    Don't listen to feedback （反馈） and keep following your own path. The problem of asking for feedback is that the feedback will be given according to the person's past experience. Others will unconsciously push you in a direction that they see as best. {#blank#}4{#/blank#}. Just don't let criticism （even the constructing type） destroy your creativity during the creative process.

    {#blank#}5{#/blank#}. Routines are positive if they strengthen a healthy creative consciousness and negative if they destroy that. The key is to discover a creative routine that puts you in a more creative mindset.

A. Creativity is not like a lightning strike

B. Having a routine is actually not a bad idea

C. You can literally do anything you like with them

D. Resourcefulness is about making the most of what you have to work with

E. The more limited your set of tools is, the more creative the output will be

F. This is done with good intentions, but it actually hurts your natural creativity

G. While breaking your routine once in a while to force new ways of thinking is good