BEIJING—The sky is gray and air smells strange．It's another day of smog．On Saturday，heavy haze (霾) still covered north and east China．Highways were closed and1 couldn't take off on time．

    The smoggy weather 2 the country's land from north to south，including Beijing, Hebei， Shandong，and 60ther provinces．People could only see clearly 3 than 50 meters in some areas．

    Cities 4 Shanghai and Nanjing have been covered by the gray sky for the past several days．Many walkers in the street had to wear 5 ． In the Lukou airport in Nanjing more than 60 flights were canceled on Saturday 6 the haze，which also made primary and middle schools and kindergartens stop 7on Thursday and Friday in Nanjing．

    The office worker of Environmental Protection said earlier this week that there were several 8 reasons behind the widespread haze：unpleasant weather conditions making9 difficult for smog to disappear，automobile exhaust(尾气)，and coal use for winter heating．

    To fight pollution，the Chinese government now plans to clean up the air by cutting coal use，10 some factories，and removing 6 million old cars from the roads．

     “We must face up to the facts，”said Yan Naiqiang，a professor of environmental science at Shanghai Jiao Tong University．“The treatment of smog will be a long fight． From now on，if we use buses or cars less and do more tidin9，we believe a clear sky is not a faraway dream．”

    It's very important that we all recycle. In nature, everything can be1again. For example, when an animal dies, it becomes 2animal's food. Nothing is wasted. But humans have created things like plastic bags 3can't be broken down by nature. Our rubbish kills animals and 4water and soil. 5we continue making too much rubbish, the problem will only get worse. If nature can't reuse the rubbish, we must recycle6.

    We should clean up the rubbish we've made because nature can't.

    Recycling is also the right thing to do for another reason. The earth is rich in natural materials like water and trees,7these materials are not endless. We use up our natural materials much8than the earth is able to reproduce them. For example, each year we cut9more that 6,000 square miles of forest. But it takes about 25 years 10a new tree to grow.

    Recycling can help us save the earth, so let's take action right now.

    It's very important that we all recycle.In nature,everything1 again.For example,when an animal dies,it becomes2 animal's food.Nothing is wasted.But humans have created things like plastic bags which can't be3 down by nature.Our4 kills animals and pollutes water and soil.5 we continue making too much rubbish,the problem will only get worse.If nature can't reuse the rubbish,we must recycle6 .We should clean up the rubbish we've made because nature can't.

    Recycling is also the right thing to do for another reason.The earth is rich in natural materials like water and trees,7 these materials are not endless (无尽的).We use up our natural materials8 faster than the earth is able to reproduce (再生) them.For example,each year we cut9 more than 6,000 square miles of forest.But it takes an average of 25 years for a new tree10 .

    Recycling can help us save the earth,so let's take action right now.

    There was a small village near the mountain. There were a lot of trees in the mountain. People in the 1 always got something from it, such as animals and trees.  When they wanted to 2 a house, they cut down the trees. And they also killed the animals for 3 . Trees were very 4 in their daily life. They made tables, chairs 5   beds by cutting down the trees. In addition, when they 6 meals, they still used some trees for wood. However, they only cut down trees but 7planted new trees. So the trees were fewer and fewer; the animals were becoming 8 as well.

    One summer, it rained 9in the village. The rain lasted for about a week. The soil(土壤)and the stones on the mountain fell down and soon 10  the whole village. They finally knew they should not only cut down trees but also needed to protect them.

    Hello, human friends. My name is Nick. I am a turtle (海龟). I have lived in the 1 for over half a century. In general, turtles can 2 to be more than 100 years old. 3many of my friends are now dying from one thing: plastic(塑料).

    Human beings use too 4 plastic. When you throw plastic away, it doesn't just disappear. Over 90 percent of the world's plastic doesn't get recycled(回收). A lot of plastic 5in the ocean. Most of my friends do not know the danger of plastic. They think it is 6. But in fact, plastic is 7. Around 30 percent of my friends have plastic in their body. I have plastic in my body, too. Plastic is also 8 other sea animals. Last month, one of my friends died after eating 80 plastic bags. I feel so 9 about it.

    My human friends, please 10 using too much plastic. Maybe one plastic bag or one coffee cup won't make a difference. But when seven billion people all start to use less plastic, it will make a big difference.

    Nowadays many people are talking about aliens. You might see them 1.

They are very smart, but they look 2. They travel in spaceships.

    But are there really aliens in space? British scientist Stephen Hawking, thinks so. He says that people 3 look for aliens. He thinks they are dangerous.

    On a British TV programme, Hawking says, "It is 4 that there are aliens in space."

    "They might live in big ships. They have 5 all the resources(资源) from their home planet." he says.

    He thinks such aliens might get resources from Earth and then go away. They may bring 6 to the Earth.