森林生态系统与下列哪些生态系统有关系？（ ）
A．河流生态系统
B．海洋生态系统
C．农田生态系统
D．以上三项全是
生物圈是地球上所有生物与其生存的环境构成的一个生态系统，它包括大气圈的底部、水圈的大部和岩石圈的表面三个部分．包括所有的生态系统：森林生态系统、海洋生态系统、农田生态系统、草原生态系统、淡水生态系统、湿地生态系统、城市生态系统等，是最大的生态系统．
生物圈中的每一个生态系统都与周围的其他生态系统相关联，这种关联性表现在方方面面．例如，我们的母亲河--长江和黄河，作为河流生态系统，源自西部源头的森林生态系统、草原生态系统．河水奔流东去，滋润着沿途的农田生态系统，养育着亿万人口和其他生物．它们沿途还形成湖泊生态系统、湿地生态系统，最终夹裹着陆地上的土壤和其他物质，融入海洋生态系统．
故选：D
PART FOUR WRITING SECTION A Directions: Read the following passage. Complete the diagram by using the information from the passage. Write NO MORE THAN THREE WORDS for each answer. As a parent you may realize the importance education has in our lives, however, your child hates listening to any of your arguments, thoughts and ideas. A student uninterested in education will miss college lectures and perform extremely poorly in assessment tests. In the worst cases, students may stop attending the school or college and sit at home without any concern for career, education and life. In order to encourage the students back to their college life and career, parents should first find out what causes the lack of motivation in students. Low self-respect in students forces them to give up challenges. Even if these students try and complete some tasks, they’re clouded by many negative thinking patterns that block the flow of confidence in their personalities. Lack of love at home can also result in the lack of motivation in students. If the parents are away from the kids or students and they’re unaware of what their kid is doing in school, then the child feels neglected and steps back from taking responsibilities and challenges. Constant poor performance lowers the self-confidence of the student and the student will feel lost in the crowd of brilliant students. Such academic pressures can make students lose their motivation. Nothing can be a better motivation for students than their teachers and parents. Schools should organize motivation activities for students, like games, sports and competitions, which are important for the whole personality development of the students. Involve them in some activities like dancing, music etc. that they are interested in, so that they can learn new hobbies and increase their confidence. You should stop ignoring your child’s studies and do understand his need to be heard. In short, lack of motivation in students can be completely reduced if the parents and teachers understand the kid and support him / her to break any of his / her negative patterns of thought. Title (71) ___________in Students
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