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[单选题]
全球范围内,影响陆地系统初级生产力的因素不包括( )
A
日光
B
温度
C
面积
D
降水量
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试题答案:
C
答案解释:
相关题目
光强度的变化会引起大气和土壤温度和湿度的改变,这属于生态因子的( )
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下列属于可再生能源的是( )
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下列属于原地实验的是 ( )
般来讲,土壤的质地可分为沙土、黏土和_________3大类。
“生态学”这一学科名词最早是由德国动物学家海克尔提出的。( )
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在结构化分析方法的基本术语中,数据流的起点称为
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第一个正式播放彩色电视节目的是
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第二部分: 阅读选择(第11~15题,每题2分,共10分)阅读下面短文,请从短文后所给各题的4个选项(A、B、C、D)中选出 1个最佳选项,并在答题卡相应位置上将该项涂黑。Urban Gardening Urban gardening refers to the practice of planting agarden in the city.Apartments,town homes,andother areas with lttle or no landare being used for gardening.This method of ardening is becoming more common as the amount of land for gardening incities is becoming smaller and smaller. Containers,hanging baskets and raised beds are examples of items people use to create a garden in a confined space.Some cities also offer a shared community garden for people who have no room to grow plants at home. Many types of plants can be grown in containers and baskets.Tomatoes andpeppers,for instance,can grow in containers on windowsills(窗台).Plants grown on a windowsill should usually receive at least six to eight hours of sunlight daily.Herbs are often grown in containers or baskets in the kitchen.They do not require much space and can be handy for cooking. People who want to grow more plants may use raised beds which are usually made of wood pieces and flled with a mixture of soil and fertilizers.They can be built on top of any hard surface,including roof tops.People like them because the beds often cost much less than most other methods of gardening. Community gardening could be an option for anyone who does not have spacefor a garden at home.Most cities that offer this will rent a small plot of'land to someone for a fee,or allow them to use it free of charge.Instead of dividing the land into separate plots,some cities allow everyone inthe neighborhood to share andwork on the same land.This method could be beneficial for people in the neighborhood who share the passion for growing things.
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下列各项,会影响所有者权益总额发生增减变动的是()
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试述对外开放与独立自主、自力更生的关系。
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