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无论是生物地理学家还是生态学家,都以__________作为划分生物群落类型的基础。
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第1空:[ "参考解析: 植被" ]
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农业生态系统是一种人工驯化生态系统。 ( )
当系统内组份较多而且彼此功能较协调时,系统的__________能力较强,系统稳定性较大。
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逻辑斯谛方程中的修正项(K-N)/K,是__________。
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148. 快门速度的大小决定曝光量的大小。( ) (1分)
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2. It was not yet eleven o'clock when a boat crossed the river with a single passenger who had obtained his transportation at that unusual hour by promising an extra fare. While the youth stood on the landing-place searching in his pocket for money, the ferryman lifted a lantern, by the aid of which, together with the newly risen moon, he took a very accurate survey of the stranger's figure. He was a young man of barely eighteen years, evidently country bred, and now, as it seemed, on his first visit to town. He was wearing a tough gray coat, which was in good shape, but which had seen many winters before this one. The garments under his coat were well constructed of leather, and fitted tightly to a pair of muscular legs; his stockings of blue yarn must have been the work of a mother or sister, and on his head was a three-cornered hat, which in its better days had perhaps sheltered the grayer head of the lad's father. In his left hand was a walking stick, and his equipment was completed by a leather bag not so abundantly stocked as to inconvenience the strong shoulders on which it hung. Brown, curly hair, well-shaped features, bright, cheerful eyes were nature's gifts, and worth all that art could have done for his adornment. The youth, whose name was Robin, paid the boatman, and then walked forward into the town with a light step, as if he had not already traveled more than thirty miles that day. As he walked, he surveyed his surroundings as eagerly as if he were entering London or Madrid, instead of the little metropolis of a New England colony.26. The story took place in____.A. springB. summerC. fallD. winter
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_________是一种数理统计方法,它是建立在大量统计数据基础上寻求数据变化规律的一种方法。
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