根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

A：You look unhappy today．小题1:．

B：Yesterday when I came home，I found my parents looking through my schoolbag．I got very angry．Shouldn’t I keep my own secrets?

A：Of course you can keep your private ideas and secret things．小题2:．

B：No，but I shouted to them．They didn’t say a word．They just kept silent．小题3:．

A：In fact，your parents shouldn’t look through your schoolbag．They should respect your privacy．小题4:．They want to make sure you aren’t in any trouble，and they want to understand your life and study better in this way．Maybe you hurt your parents．

B：I agree．小题5:．

A：Say sorry to them．Try talking to them more．Let them know what you are doing，so that they won’t worry about you so much．

B：OK．I’ll do as you told me．

简单说明传热的三种方式。