为了方便盲人行走，在马路两旁的人行道上设置有凸棱的盲道。小明在盲道上走路很不舒服，原因是在盲道上，脚与地面的____减少，从而增大____。

阅读短文，下列问题

Why do children like watching TV?

       Many children like watching TV. It's very interesting and they can see a lot and know many things about other people. They can learn from the radio, too. But they can learn easily from TV. Why? Because they can hear and watch at the same time. But they can't watch anything from the radio.

    TV helps to open children's mind. They can find better way to do things.

    Many children watch TV only on Saturday and Sunday evenings.They are very busy. But some children watch TV every night. They go to bed late. It's not good for their eyes and health.

观察这三幅图，按要求填空。

在上面看到 是____；在上面看到是 是____；在上面看到是 ____。

小鹭设计的“探究影响滑动摩擦力大小的因素”实验方案如图所示