如图，是由几个小立方块搭成的几何体的俯视图，小正方形中的数字表示该位置小立方块的个数，请画出其主视图：____ 

某中学生不思学习，迷恋网吧，常常夜不归宿，屡教不改，后发展到持刀抢劫，致人重伤，结果受到刑罚处罚，这案例说明（     ）

先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。

    On weekends，I don't need to go to school．I often go to1my grandfather,and he lives in a small town．

    It is a long way from my home to his home．Mick and Ted go2me．They are my cousins．Do you know how we go there? We ride our bikes there!We like3a lot．We start at nine o'clock in the morning,We4a lot of food and drink with us—bread ,milk,eggs and juice, 5we have lunch on the way．At about three o'clock in the afternoon,we6at the town．My grandfather is very7to see us．There is a park near his home，so he takes us to the8and we take a walk there．We9with my grandfather．The next day,we ride back home．We are tired (疲劳的)10very happy．

下列表示铁路的图例是（    ）