题干

被称为“地球之肾”的生态系统是____;被称为“绿色水库”的生态系统是____;森林生态系统与农田生态系统相比,稳定性更强的是____,属于人工生态系统的是____
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湿地生态系统,森林生态系统,森林生态系统,农田生态系统

同类题3

阅读下面短文,从短文后各题所给四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑

    Teachers selected from each district school for the Teacher of the Year competition were recognized.The competition's winner will be1in the spring.All those model teachers got me to think about some of my teachers through the years, and how they2me.

    My college adviser, J.C.Casey, had a big3on my life.She was a teacher and friend.She4me to consider journalism as a career.My high school math teacher,Kathy Cloud,took the time to5math to me in a way I could    6understand.I'd struggled with math until I got in Cloud's classes.She gave me the7to realize I could do it.

    My first-grade teacher, Darlene Dryden, held me back. Now, most people wouldn't8the teacher that kept them back a grade fondly, but Dryden has always been my9teacher.I was the youngest person in my class and very shy. She thought I10another year to mature before moving on to second11.She didn't make me feel12for having to repeat the grade.Instead,he made me feel13.I think I was her favorite, too.

    My senior year of high school, right before14,I wrote Dryden a note letting her know that I'd become a good student and was going to15and that she'd had a16in that.

    The Norman teachers17Wednesday are just a few of the many who are in the classrooms every day making 18in their students' lives.They may not even know the19impact(影响)they're having.I know it's not an20 job, but teachers, just remember that you're a Mrs.Dryden to somebody.