《珠宝》《项链》两文思想内容有什么不同？

    My name is Sally. I am a school girl. My school is far from my home. So I can't go to school by bike. I often go there by bus. I must get up very early every morning. I have no time for breakfast at home. I often eat something for breakfast on the way(在路上). I want to go to school on time(按时).

7月份，中国的学生开始放暑假，此时，南半球澳大利亚的季节是（    ）

如图是用木棒撬石块的示意图，请在图中用小黑点标出支点，用符号O表示，并画   出动力F的力臂．