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调和人与自然的矛盾,要实行利用与保护兼顾的策略,用而有度,主要是坚持收获量小于__________的原则。
原始森林遭到破坏后,到再次形成森林的过程为( )
种群的逻辑斯谛增长曲线是( )
现代生态学以人为研究中心,更加注重实践研究。( )
玉米与豆类间作,其关系属于 ( )
个体生态学的基本内容与 相当
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饶基耶尔(Raunkiaer)将不同地区植物区系的生活型谱进行比较,归纳得出四种植物气候,其中有潮湿热带的高位芽植物气候与热带和亚热带沙漠的__________气候。
生态学按研究方法划分,可分为野外生态学、__________和理论生态学。
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1.
Man has always wanted to fly. Even as long as eight hundred years ago, an Englishman had tried. He made a ___21___ of wings from chicken feathers fixed them to his shoulders. Then he jumped from a tall building. As you can imagine, he did not fly very far. ___22___, he fell to the ground broke several bones. The first real attempt at flying took place in France in 1783. The two Mongolian brothers knew that hot air rose. If they could fill a large balloon ___23___ hot air, they thought it would rise into the air fly. They were right. They made a very large hot air balloon of cloth paper. It measured ten meters in diameter. They filled it with hot air the balloon got two hundred meters into the air. It fell to earth about three kilometers away.At the next attempt, they ___24___ for a balloon to carry passengers. We do not know what the passengers felt about the trip as they were a cock, a duck, a sheep. But we ___25___ know that the trip lasted eight minutes the animals landed safely.A、InsteadB、pairC、doD、arrangedE、with
2.
l2.以不伤害自己和他人的健康,不破坏社会道德生活的方式,将心理上积存的郁闷统统地打发出来,这是
3.
Historically, ___ were ferocious people, but they laid the foundations of the English state.
4.
五、V. Daily Conversation ( 15 points )
5.
对最后一段有关“病毒”内容的理解,不正确的一项是() 查看材料
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