点M与点F（4，0）的距离比它到直线l：x+5=0的距离小1，则点M的轨迹方程是____ 

选词填空。

    I'm Zhou Qin．Sometimes I go out to____when I feel tired．Last week，I visited a small village．

I____at the village in the morning．It was cold but i was very____．My friend，Li Guang，met me at the station and we walked towards an old____．We watched some pictures on its walls and I____some photos．I wanted to write about those pictures．

土壤呼吸年通量是指一年中垂直地面单位面积上土壤与大气之间CO₂的交换量。它是陆地生态系统最主要的炭释放过程。土壤植物根系和微生物的呼吸是CO₂的主要来源。图示意我国北方某山地三种典型森林的土壤呼吸年通量。读图，完成下列问题。