先解释古诗中加粗词的意思，再写出诗句的意思。   

1．乡村四月闲人少，才了蚕桑又插田。

     了：                                                                                           

     诗意是：                                                                                  

2．童孙未解供耕织，也傍桑阴学种瓜。

     未解：                                                                                        

     供：                                                                                           

     傍：                                                                                           

     诗意是：                                                                                  

3．相看两不厌，只有敬亭山。

     厌：                                                                                           

     诗意是：                                                                                  

4．江南好，风景旧曾谙。

     谙：                                                                                           

     诗意是：                                                                                     

CCS系统中调节作用正反作用的确定是用哪个宏命令来实现的（）。

A.PIF

B.SUB

C.NOT