题目

Thinking is something you choose to do as a fish choose to live in water. To be human is to think. But thinking may come naturally without your knowing how you do it. Thinking about thinking is the key to critical（判断性的） thinking. When you think critically, you take control of your thinking processes(过程). Otherwise, you might be controlled by the ideas of others. Indeed, critical thinking is at the heart of educa­tion. The word “critical” here has a special meaning. It does not mean taking one view against another view, as when someone criticizes another person for d在倾角为θ的斜面上物体，沿斜面下滑一段位移s，F是作用在物体上的其中一个力．如果F沿水平方向作用于物体，则力F对物体做的功为________；如果F沿竖直方向作用于物体，则力F对物做的功为________．