The population of Earth is still going up. There will be less and less good land for growing crops in the future. People worry that there will not be enough food for everyone in the middle of this century.

    Recently scientists have discovered one strange plant named fedtschenkoi（玉吊钟）may help. It can absorb（吸收）carbon dioxide(CO₂) at night. It only needs 10 times less water than food plants like beans. This means it can grow in the desert(沙漠).

    In which ways could this plant help us?

    Since deserts are increasing in size because of the changes in Earth's climate, growing plants there will be more and more important. Although it is dangerous to eat this plant, scientists can still study something about it: how it absorbs CO₂ at night while many other plants only do this during the day, and why it is suited to the desert.

    There is another direction to take the research in. Producing a desert plant to eat will be difficult, but there is still possibility to use the genes(基因)from this plant and put them into food plants.

    The other way is to grow this type of plant for fuel(燃料). At the moment we grow plants for fuel in good land. If we do it in deserts instead, more good land can be used to grow plants for food.

    Desert plants have special qualities, which could be an answer to our future food or energy needs. Scientists are working hard on it.

    Are you learning a foreign language? Do you know what a successful Language learner should do?

    First of all, successful language learners are independent(独立的) learners. They do not depend on books or teachers. They find out their own ways to learn the language. Instead of waiting for the teacher to explain, they try to find methods and rules for themselves. They also look for clues (线索)and get their own ideas by guessing(猜测). When they guess wrong, they try again. They try to learn from their mistakes. It is more important for them to learn to think than to know the meaning of every word.

    Successful language learning is active learning, so successful learners do not wait for a chance to use the language. They usually look for such a chance. They find native speakers and ask them for help when they make mistakes. They will try everything to communicate. They are not afraid to what they hear or to say strange things.

    Finally, successful language learners are learners with a purpose(目的).

    They want to learn the language because they are interested in native speakers' lives. It is necessary for them to learn the language in order to communicate with foreigners and learn about their lives. Their cultures and so on.

    Great white sharks in the Pacific Ocean. Wildebeest (角马)in Africa. Arctic terns(北极燕鸥) in the Atlantic. At first, these animals seem quite different. One swims, one walks, and the other flies. But they all have one thing in common, They all migrate(迁徙).

    Some migrating animals move to a place with a better temperature. Some go to find food or water. The groups travel as one, but during the trip, they face many different challenges.

    One challenge is distance. Some migrating animals take very long trips. For example, one great white shark swam from Australia to South Africa and back. In nine months, it swam about 20, 000 kilometers!

    Another challenge is finding enough food and water during the journey. For example, each Mali elephant needs over 200 liters of water each day. To get this, they need to go from one waterhole to another.

    Besides, migrating animals have to keep away from other animals that want to eat them. The zebra (斑马) has to avoid lions. Traveling as a group helps keep them safe. When one zebra is in trouble, the other members make a circle around it.

    By working as a group, migrating animals travel to live better lives.

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    The purpose of students who come to school is to study.  But studying needs right ways. The following opinions are ways of studying.

    The best time to read is morning. Because in the morning, the air is fresh and our minds are clear.

    When we study, we must be patient(有耐心的). If we don't understand a text well, we must read it again. We should not read the next until we have learned the first one well.

    When we are studying, we must put our hearts into the book. We cannot read absentmindedly(心不在焉),or we couldn't get anything form the book while we are reading.

    We must always ask "why". If we can't understand well, write it down and ask our teachers or parents, brothers or friends, in any possible ways.

    Though there are many ways for studying, however, the above mentioned will be helpful if we can keep them in heart.

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