根据短文理解, 从A、B、C、D四个选项中选择最佳答案填空。

    Have you ever taken a tour of a zoo? If so, it's likely that the person who led you through the zoo helped you to learn a lot about the   1.

    Amelia Rinas is a high school student who lives in Ohio. One day Amelia 2   the Cleveland Metroparks Zoo. The moment she saw the gorillas there, she left 3  about them. She wondered if they were getting the right foods.

    Amelia read all she could about gorillas and learned what they like to 4 . Then she started a "gorilla garden". She grows the fruit and vegetables that gorillas love to eat. Some of those foods are tomatoes, carrots, and strawberries. Amelia works with other volunteers in her community who use their 5   time to help Amelia and the gorillas. When they take the food to the zoo, the gorillas are thrilled. They look so excited!

    Who is responsible for Amelia's interest in animals? Amelia is a member of Roots& Shoots. Its members are young people who   6   animals and the environment. They helped Amelia understand that animals need our care too. The slogan on the Roots &Shoots Website is "Inspire, take action, make a difference." These words tell  7 the group is all about. The group urges(力劝) kids and grown-ups, including parents and teachers, to do what they can to make a   8where they live.

    When interviewed about her project, Amelia said, "I joined Roots & Shoots  9    I wanted to make a difference in the world."

      There are many 10 to make a difference in the world. Amelia Rinas' gorilla garden has helped make gorillas happier and healthier.

    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．”

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

    When talking about inventors, who do you first think of? Forget Thomas Edison. Meet the teenage 1 at the 24th Jiangsu Adolescents Science &. Technology Innovation Contest(江苏青少年科技创新大赛).

    Wang Xingyu, from Kunshan No. 2 Middle School, invented "a 2 line" in the zebra crossing. Wang often saw people running through

the red 3 , so he thought of an idea,

    "I 4 a spray tube(喷管) in the zebra crossing. When the light is red and 5 crosses, it sprays water. If the light is 6, it will not work," said Wang.

    But does it 7 water? "There's a water channel(槽) on the ground, so the water will be collected and 8 again," he said. Zong Hangchen, from Nantong Special Education Middle School, also got his invention idea from daily experience.

    Zong's 9 could only feel a little light. When he walked on the sidewalk for the blind, he often came across obstacles(障碍物). Once he 10 hurt his nose.

    11 help himself and the blind, Zong made something that has radar(雷达) and a loudspeaker. Users tie radar onto their knees and 12 the loudspeaker around their necks. When they meet obstacles, the radar will see them and the loudspeaker will make a 13 to tell the users.

    Chen Huijuan, an official from Jiangsu Association for Science and Technology, was 14 at these inventions.

    15 some ideas are simple, the creations are very good," she said. "Get inspiration( 灵感) from small things in life and you can be an, inventor, too.

    Can you imagine that we could build a beautiful city with rubbish? Maybe you will think it is1. However, it can be true! Nothing is a waste if we have a creative mind. Let me show you something about 2rubbish.

    Sometimes we can see tons of rubbish in the streets, on the roads, near the buildings... here and there.  Many large cities became so ugly 3 it. Nobody likes rubbish, but in fact, some rubbish can be used again. All of us want to solve the problem, we must do something to 4 rubbish. We should take action from now on. 5, some good things will not be wasted.

    Do you often throw away things you don't need any more? Have you ever thought about how these things can actually be put to good use? For Example, when a car gets too old, it may not run any more. But we can use the metal of the car to make something else. When a bottle is empty, it 6 as waste. You don't know bottle glass can be made into sand and used to build streets. Rubbish7food can be changed into fertilizer to make plants grow better. It is cheap and safe. And other rubbish can also be used to make building blocks. Now, 8machines are designed for that.

    9, people will watch films in a beautiful cinema which is built out of rubbish. Besides buildings and roads, cities may be made from rubbish. But so far, building beautiful cities made from rubbish is only 10.