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[单选题]
20. （ ）是指栽培目的所需要的产品的收获量。（2分）
A
A生物产量B经济产量C光合产量D净生产量
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B
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第33答案是（ ） 查看材料
下列四组树种和农作物，大致分布在同一温度带的一组是（ ）
A.fatsB.lessC.moreD.heavy
DCopernicus was born in Torun, Poland, on February19, 1473. Little is known about his early life except that his father died when he was 10. An uncle adopted (收养) him, his two sisters, and his brother. The uncle saw to it that the two boys received a good education. Copernicus went to the University of Cracow. There he studied such subjects as Latin, mathematics, and astronomy. It was probably at that time that he changed his Polish name, Niklas Kopernigk, to the Latin form of Nicolaus Copernicus. In 1946 Copernicus went to Italy, where he spent the next 10 years studying at various universities.In Copernicus’ time people still believed that all things—the sun, the stars, and the planets—moved around the earth. It was an old belief that few men had ever questioned. Aristotle had based his theory of astronomy on his belief. Because the Church had long been the center of learning, the theory was also linked to religious (宗教的) beliefs.In 1506 Copernicus returned to his homeland. A few years later he began to work for the Church. All those years Copernicus carried on his work on astronomy. He had just the most basic equipment and, like other scientists of his day, made observations with only his eyes. Still, using mathematics and logic (逻辑)，Copernicus worked out a different theory, which held that the planets went around the sun.Copernicus did not announce his ideas. He did not want to make trouble. But he could not hide the scientific truth. So he talked about his theory with his friends, who strongly advised him to have his work published. His great book. On the Revolution of the Heavenly Bodies appeared at the very end of his life. Copernicus saw the first copy on the day he died, May 24, 1543.
18岁的小王与25岁的张某伪造虚假证明办理了结婚登记，则其婚姻（）
早春，植物开始发芽、生长；盛夏秋初，植物繁茂生长；秋末，植物干枯休眠；冬季，植物枯黄，这些都是群落的一种 变化。
对食物消化最彻底、消化力最强的消化液是
德育原则是有效地进行德育工作必须遵循的（ ）
50.教学创新的理论依据主要有（ ）（1分）
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4.企业再造理论强调，企业再造中一定要牢固树立
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影响小学生性格发展的最直接因素是( )
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26.关于新系统的用户培训，下列叙述中，错误的是
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基督教在中国设立的最大出版机构广学会发行的报刊是（ ）
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27.下列关于白盒测试的叙述中，正确的是
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