在子女与父母之间充当遗传物质的“桥梁”作用的细胞是

    It is necessary to relax ourselves after the exam. There are some kinds of  activities for us to take part in. First of all, we can go for a w____ along the bank of the river. We can also go to the movies or listen to music. What's more, joining in a sports club is a good c____, which can keep us healthy. For example, p____ football in the afternoon may relax ourselves. Above all, we should arrange(管理) our time p____ and live a regular(规律的) life. I hope all of us can have a wonderful time.

孟子曾用“金声玉振”来形容孔子的思想：“金声（奏乐开始）也者，始条理也；玉振（奏乐结束）之也者，终条理也。”主要指孔子思想（   ）