四个生产层理论的基本内涵与外延？
参考答案：
1.前植物生产层（前初级）：以草原动植物及土壤、大气所构成的草原景观（旅游）及生态服务功能（水土保持、自然保护区、城市绿地草坪）、人文历史价值、生物多样性保护。
2.植物生产层：传统的草产品生产（牧草或其它饲用植物。如青草、青干草、草粉、青贮等）
3.动物生产层：传统的畜产品生产（家畜等草食动物的肉、奶、蛋和皮毛等）
4.外生物生产层（后动物）：动、植物产品的深加工（叶蛋白、色素、酶、生长激素、纤维素、蔬菜汁液（作保健饮料）与流通环节。即畜产品加工业。动物生产层是传统畜牧业主要方面，植物生产层农业结构调整方面，则在当前退牧还草、和前植物生产层与外生物生产层生产潜力远没发掘（草产品加工、旅游等方面已有较大发展）
请阅读下面短文，选择最佳答案，将其标号在答题卡上涂黑。 Smiling is the best way of making friends. When I was thirteen 46 old, my father found a job in the city. So my family moved there. I also came to a 47 school near where we live. My old school was far away. At first, I did not know anyone in my class. I was very lonely 48 I was afraid to make friends with my classmates. I 49 talk to anyone about my problem, and I didn’t want my parents to 50 me. Then one day, something good happened. I was sitting at my desk 51 as usual while my classmates were talking happily with each other. At that moment, 52 came into the classroom. I didn’t know who he was. He passed me and then turned back. He looked 53 me and, without a word, smiled. Suddenly, I felt happy, lively and warm. That smile changed my life. I started to talk with the other classmates and made friends. Day by day, I became 54 to everyone in my class. 55 the smile, I have moved on to a new life. Now, I believe that the world is what you think it is. So smile at the world and it will smile back.
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