题目

On September 22, 1986, Jay Brunkella, a police officer in the Rogers Park district in Chicago, was shot during a drug arrest and died. Shortly afterwards, fellow officer Ken Knapcik, a 20-year veteran（老警官）of the force, returned home after work to find a note from his 15 year old daughter on the dining table. Dad—This poem came directly from my heart. I love you so much! It scares and amazes me that you go out every day and risk everything to provide us with all that we have. I wrote this to express how much I love you and how much lost I’d be without you ---Laura. PS: Hey, let’水土流失是一种统一的自然地理环境演化过程． （判断对错）