根据材料内容，选择正确答案。

    The earth is about 4,600 million years old. Modern man has lived on the earth for only 35,000 years, but during that time, we have changed our planet in many ways. Many of the things that we have done are good, but more are not good for the earth.

    Water pollution

    A lot of people, birds and fish die each day because of water pollution. Factories have polluted the land and the water. As a result, many river and lakes are now dead.

    Air pollution

    In big cities, factories, as well as cars, trucks and buses are the biggest cause of air pollution. Many people in cities now have bad health problems. For example, Mexico city used to be a beautiful sunny capital, but today it is almost covered by thick brown clouds.

    Soil pollution

    In order to have a good harvest, most of the farmers use chemicals too much on their fields. That's bad for the soil. But this kind of pollution is difficult to stop.

    Hope for the future

    These problems are very serious for our future, so all of us should do something to improve our environment. If we can stop pollution, our planet will become more and more beautiful and our health will be better. Let's be greener people.

“打倒列强，除军阀；国民革命成功，齐欢唱…”这首慷慨激昂的《国民革命歌》唱响于（　　）

阅读材料，回答问题
材料一、他是美国第一任总统，他被美国人民永远怀念。
材料二、我们以这些殖民地的善良人民的名义和权力，谨庄严宣告：这些联合殖民地从此成为、而且名真言顺地应当成为自由独立的合众国，它们解除对于英王的一切隶书关系，而它们与大不列颠王国之间的一切政治联系也应该从此完全废止。

阅读下列短文，从每题所给的四个选项（A, B, C和D）中．选出最佳选项.

    Peter loved to shop used articles（物品）. Almost a month ago, he bought popular word game that used little pieces of wood with different letters on them. As he was purchasing it, the salesgirl said, “Uh, look, the game box hasn't even been opened yet. That might be worth some money. ”    

    Peter examined the box, and, sure enough, it was completely covered in factory-sealed plastic. And he saw a date of 1973 on the back of the box.       

    “You should put that up for auction (拍卖) on the Internet, and see what happens.” the salesgirl said.       

    “Yes, you're right. People like something rare.” Peter agreed, “I can't imagine there being very many unopened boxes of this game still around 40 years later.”       

    “Don't forget to tell me if you sell it.” the salesgirl smiled.      

    “No problem.” Peter said.       

    After he got home, Peter went online to several auction websites looking for his game. But he couldn't find it. Then he typed in the name of the word game and hit Search. The search result was 543 websites containing information about the changes of the game. Over the years, the game had been produced using letters in different sizes and game boards in different colors. He also found some lists of game fans looking for various versions of the game. Peter emailed some of them, telling them what he had.      

    Two weeks later, Peter went back to the shop.       

    “Hello. Do you still remember the unopened word game?”      

    The salesgirl looked at him for a second, then recognized him and said, “Oh, hi!”

    “I've got something for you,” Peter said. “I sold the game and made $1,000. Thank you for your suggestion.” He handed her three $ 100 bills.       

    “Wow!” the salesgirl cried out. “Thank you, I never expected it.”