冷战时期，北约、华约等军事政治性组织是影响世界格局的重要因素；冷战结束后，各

类国际经济合作组织的重要性与日俱增。这一变化趋势主要反映了当今世界(    )                                               

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--What did you think of the performance given by the famous dancer?
---Not so good. In fact, it ________ to be a great disappointment.

阅读下面短文，掌握大意，然后从A、B、C、D四个选项中选出最佳选项。    I was feeling a little blue because my mother had lost her job.
    One day, while I was 1 on the street, I heard piano music and singing rising above the noise of the people. I walked more slowly to 2 where it was coming from. Then I saw a young lady sitting at a piano.
    She was singing songs about love, 3 yourself and keeping on trying. The way she was singing made me a little comfortable. I stood there 4, watching her playing on such a crowded New York square. I thought that she must be 5 enough to perform(表演) in front of so many people.
    She noticed me. I walked over and told her how good her 6sounded. "Thank you." she said.
    "I am going through a hard time, 7 you made me hopeful again." I said to her.
    "I'm glad that I could help," she answered. "Why are you so 8?"
    "Well, my mum lost her job, and I'm not so sure what to do……"
    "Did you notice the 9 you were walking? Your head was down." she said. "Don't be worry, because10comes in different ways and if your head is down, you might not see it. You should11 more …… lift(抬) your head up. "
    I looked 12 her, surprised at how she was encouraging(鼓励) me. "13 are you playing the piano here?" I asked her with a smile.
    She 14 that she saw a lot of unhappy people in the world and she tried to make 15 happy by playing music.
    I smiled a little wider, realizing that no difficulties could stop me from going on.

我国跨世纪的四大工程，在促进西部大开发、资源大调度等方面具有重大意义。读我国四大工程示意图，完成下列各题。

勇于实践，用事实说话是我们中学生应具备的优秀品质。图中是某中学生通过测量绘制的二分二至日正午时刻校园内的旗杆影子长度的简图。读图，回答该中学生所绘制的①②③图中，可能代表夏至日的是