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土地是最基本的资源，它是矿物质的储存所，它能保持土壤的肥沃，能生长草木和粮食，也是野生动物和家畜等的栖息所。
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我国人口众多，适于农耕的土地资源有限，又普遍存在着居住环境任意扩大和大量占用耕地的问题。因此，土地资源浪费无所谓。
水的社会功能有哪些？
填词补文 （答案写题号即可，注意大写）A. whileB. shareC. onD. uniqueE. whateverF. thatG. oppositesH. a couple ofI. personalitiesJ. wiselyK. ofL. whoseIn the daily drama and comedy of our life, it's nice to have friends.1 family is extremely important, friends are a different support system of your choosing. As the saying goes, you can't choose your family, but you can choose your friends." Choosing them2 can make your life more exciting and inspiring.Deciding whom you choose as your friends says as much about you as it does them. You may choose your friends based 3 similar interests. You may choose them because you're both polar 4 of each other and find this interesting and intriguing. Often, friends become "friends" because they naturally gravitate（被吸引） towards each other because of similar 5 and temperaments. Sometimes it's just circumstances 6 bring two individuals together who then become friends.7 prompts a friendship, developing one is a very rewarding experience. This is especially true when, before you know it, a certain friendship turns into a 8 lifelong close friendship. Again, it's been said that a person normally has only 9 very close friends in their life. Think of whom you deem as truly close friends. These are those select individuals you can confide in（信赖，吐露秘密） and 10 deep thoughts and concerns with, without any reservations.
在缺口试样的冲击实验中，缺口越尖锐，试样的冲击軔性（）
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