Do teenagers in small villages do chores at home? How about the teenagers in big cities? Here is a survey. We asked 4,000 teenagers in China several questions. Half of them come from big cities like Beijing, Shanghai and Guangzhou. The others are from small villages. We made a diagram of the result of our survey. Let's have a look at it. We found out that teenagers from small villages do more chores than those from big cities. Maybe it is because they live a harder life. Our advice to parents in big cities is that parents should give their children some chores to do. Doing chores teaches teenagers to take care of themselves.

    Chores 2000 teenagers in small villages.

    Chores 2000 teenagers in big cities

不要用手指指着别人。

Don't ____  ____ others with your fingers．

我们对校园的生物种类进行调查时，首先要确定（    ）

如图，折叠直角三角形纸片的直角，使点C落在斜边AB上的点E处，已知AB=8$\sqrt{3}$，∠B=30°，则DE的长为(      )

课内《小镇的早晨》语段阅读。

    沿街摆满了各种蔬菜、水果和土特产（ ）那刚从地里拔下来的小白菜、油菜，还带着晶莹的露珠，鲜嫩嫩的（ ）那刚从河里捕来的大鱼小虾，又蹦又跳，水灵灵的（ ）还有雪白的小羊、长毛兔、大鹅……真叫人目不暇接。