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.

    Robots seem very new to most people. But they have a 1 history. A Greek scientist made the first robot. You may 2 robots in some movies. The robots in the movies are usually stronger, faster and 3 than people. In real life, most robots are used in factories. They can do lots of dangerous, difficult or4 jobs. Some people can't look 5 themselves and robots can help them. For example, some people can't see, and they use a guide dog to help themselves move. But now scientists are making a 6 to help them.

    Robots are also used in American hospitals. At one hospital, a robot 7 meals from the kitchen to the sick people's rooms. It never loses its 8 because it has a map of the hospital in its computer system(系统). 9 the future, robots will even work in space. But robots will 10 take the place of(代替)people but only work for people. They can, however, help us in a lot of different ways.

    John comes from England. When he comes to China, his friends tell him something about the traffic 1 in China. People drive on the2 in England, but in China, people should drive on the right. Before you cross street, you must look 3 ways look left, look right and look left again. 4 remember the traffic moves on the right in China, or some cars and some buses may5 you.

    In the morning and the evening. when people go to work and 6 back from work, the streets are very busy(累忙的). 7  it is the most dangerous(危险的)time. When you want to 8 the road, you must 9 for the green "walk" sign.

    In China, you can always  10  the policeman for help when you lose your way.

    March 22nd is World Water Day. It started in 1993.It not only makes us think about the importance of water, but also calls on (号召) us to 1and protect water. Today, we're facing terrible water problems. Among them, wastewater problem is especially2.And the subject of World Water Day in 2017 is" wastewater".

    What is wastewater？It is used water. Usually, wastewater comes from homes,3, hospitals and so on. It is produced by different kinds of activities, including washing the machines, taking showers and using the kitchen. The rain also 4wastewater when it is running down the street during a storm. No matter where it comes from, this kind of water is sure to have 5harmful in it.

    6must we treat (处理)wastewater？Wastewater has a big influence on our life. It causes both illness for us and pollution for the environment. We must care for our environment and our own 7.

How can we treat wastewater？Different kinds of wastewater need different ways of treatment. Wastewater 8homes can be reused. Then there will be 9wastewater. Also, factory wastewater has to be cleaned 10it goes back to nature.

    My name is Miranda Gibson. I have been at the top of a tree for five months now. Some people might wonder 1 on earth I would choose to do that.

    I have walked 2 this forest many times. On 12 December 2016, machinery (大型机械) rolled into the forest and the destruction (摧毁) began. I couldn't bear (忍受) the thought that these forests would be 3 forever. So, on 14 December 2016, I put my clothes into a bag, 4 my job plans, and climbed 60 meters to the top of this tree. I have been there ever since.

    Life in the tree tops can be challenging. I have times when I feel frustrated (沮丧的) and I wish I could 5 to have a holiday for a few days! There are times too, when I feel terribly 6. I miss my friends and family.

    Living on the tree has been exciting and encouraging. I am willing to 7 up here for a long time, 8 I honestly hope it won't be too 9 before I can put my feet on the ground below and stand in a forest that will never 10.