孙中山认为，西方国家贫富不均，劳资矛盾尖锐，“社会革命其将不远”，中国应防患于未然，因此他提出了（　　）

某国际机构在美国首都华盛顿（西五区）主持视频会议，请中国的王教授在北京给远在非洲（西一区至东三区）的同行介绍经验。下列时段中，对三方最合适的是（    ）

课文《我真希望》中用____、____、____三个词写出了生活中存在的污染现象以及“我”的心愿。

如图，将一个圆柱体放置在长方体上，其中圆柱体的底面直径与长方体的宽相平，则该几何体的左视图是（　　）

    Reading is a good habit, but the problem is there's too much to read these days and too little time to read every word of it. There are hundreds of skills to help you read more in less time. Here are two skills that I think are especially good.
    Preview — if it's long and hard. Previewing is especially useful for getting a general idea of heavy reading like long magazine articles and business reports.
    Here's how to preview.
    Read the first two paragraphs and the last two paragraphs carefully.
    Then read only the first sentence of the other paragraphs.
    Previewing doesn't give you all the details. It keeps you from spending time on things you don't really want － or need － or read.
    Skim － if it's short and simple. Skimming is a good way to get a general idea of light reading like popular magazines or the sports and    entertainment of your daily paper.
    Here's how to skim.
    Get your eyes to move fast. Sweep them across each line.
    Pick up only a few key words in each line.
    Everybody skims differently. You and I may not pick up the same words when we skim the same piece, but we'll get a similar idea of what it's all about.