Stress is the feeling you get when you're really worried about something. This is the kind of worry that troubles you for hours, or 1 days. It makes you feel blue, scared or angry. You may find it 2 to eat and sleep, or you might eat and sleep much more than usual.
Too much stress is bad for you. Stressing out can lead to serious 3 like heart illnesses. But a moderate (适度的) amount of stress keeps your body and 4 alert (警觉的) and can make your performance better, like when you are doing a presentation to your class or 5 to the finishing line.
    But, if you are seriously stressed out, look at these quick and easy ways to 6. Firstly, you can go for a run, play tennis or ride your bike for a while 7  exercise produces more beta-endorphin(B-内腓) that controls stress. Secondly, having a good 8 is very important. You should try to get at least eight hours of sleep every night. Thirdly, eating a healthy, balanced diet that 9 all the food groups will help. Also, you can talk to the people you trust . Keeping your feelings inside may make the situation10 while talking to a person you trust may make you feel better. They may be able to give you advice and help you solve your problem.

    The lion is one of the most fierce (凶猛的) animals in the world. Lions can be 1 in Africa and India. Lions in Africa can live without water for about one month. Lions are also popular animals in the 2 . Almost every zoo around the world has a few lions.

    It is very 3 for people to tell male and female lions from each other. You can judge (判断) simply by their appearance. A male lion has mane while female lions do not have. Male lion 4 than female lions. A male lion usually weighs about 200 kilograms which is always heavier than a female lion. Both male and female lions have very 5 mouths. They can break the backs of other animals 6. Lions feed on other animals and one lion usually kills between ten and twenty large animals each year for 7 .

    It's unusual for lions to kill people. However, in 1898 two lions 8 and ate over one hundred people in Kenya before they were shot by a British man named P.J. Patterson. This 9 became the subject (主题) of a 1996 Hollywood movie called The Ghost and the Darkness. Now the Indian lions are endangered. It's really necessary for us to 10 the animals, or we won't see them again. Animals are our friends. It is our obligation to protect them.

    We know the earth is a planet．There are seven other planets，and they go  1 the sun together．The eight planets and the sun are2 the solar system．The first planet，3   the sun，is Mercury(水星)．It is 58 miIlion  4  from the sun．Venus(金星)is the second planetfrom the sun，and  5 planet，the earth，is the third．It is from the sun,and 55  planet,the earth,is the third.It is 2,650 million kilometres from the sun．

    Jupiter(木星)，Saturn(土星)，Neptune(海王星)and Uranus(天王星)are all 6 than the earth，7 Venus，Mars and Mercury are smaller than the earth．

    Animals，trees and humans can only 8  on the earth，because the other planets in our solar system don't  9  air or water．Do any  10planets in   solar systems have life?We don't know about it．

Dear human beings,

    Hi! I'm 80 years old now. So I've seen 1 of the world. We've lived on Earth with you thousands of years. Each day we release(释放) O₂ and remove harmful gas so that you have fresh 2; we help prevent the Earth's soil（土壤）from being washed away, and above all, we give all kinds of fruits, nuts, beans as well as 3 to you.

    We are now in great 4 because of you. You are killing us at a terrible speed. You are burning and cutting down millions of us each year, but you're not 5enough. For every tree being planted today, 30 trees are being cut down. What would you do if all of us 6? Perhaps you would die, too.7 us, you wouldn't get enough material for buildings, furniture（家具）, paper products, and your cities would 8ugly. Moreover, air pollution and noise pollution would become more and more serious, and your life would become nasty.

    The 9 thing for you to do now is to stop your bad manner. We are the best fighters 10 pollution and we are your best friends!  

Your friend,

An old tree

    We all know that the panda is the treasure (珍宝) of our country. Then how about its droppings (粪便)? They are treasure, too. How?

    The panda keeper1an adult panda with about 25 kilos of bamboo every day. Of that, the panda will eat about 11 kilos — the most2parts. Because the panda cannot digest (消化) all the bamboo completely, its droppings3much of undigested (未消化的) bamboo. Can people make use of it? Sure, someone4in turning it into toilet paper.

    "In my opinion, it's a great5 ， " a panda keeper says. "In the past, we just threw away the droppings6rubbish. But now workers come and take the droppings away. They use the droppings to make7. They also make notebooks and bookmarks. "

    8 ， the paper doesn't sell well at the Panda Base. It is not popular with9. Most of them won't buy it after they visit the Panda Base. "A box of tissues (纸巾) is 43 yuan ， " they said. "That's quite10. " If you see the tissues at the Panda Base, will you buy them?