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目前地球上面积最大，对维持人类生存环境起最大作用的森林生态系统是( )
A
热带雨林
B
常绿阔叶林
C
落叶阔叶林
D
北方针叶林
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A
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森林中鸟的数量与森林的周长成正比，是因为服从边缘效应。（ ）
阴性湿生植物海绵组织发达，调节水分平衡的能力 。
玉米与大豆或花生间作是利用了它们之间原始合作的共生关系。 ( )
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下列属于互利共生关系的是 ( )
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光照强度的变化不仅直接影响空气的温度和湿度等气候因子的变化，同时也会引起土壤因子的温度、湿度、蒸发、蒸腾等的变化。 ( )
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地中海果蝇的生物学零度是13.5℃，发育所需要的有效积温是250℃，则其在26℃条件下生长发育所需时间为 ( )
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六、案例分析题(本大题共l小题。共l0分) 请在答题卡上作答。
2.
南昌起义的指挥者是（ ）
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4.
21. There is no doubt that new technologies will also play an important role in language teaching in the twenty-first century. Indeed, the use of technology in foreign language learning has constituted another important revolutionary movement in our discipline (学科）in the last half of the twentieth century. Although it has clearly not been a methodological revolution，technological innovation has played an important role in the recent history of language teaching and is bound to have a profound effect on the way that languages are taught in the future. Beginning with the introduction of filmstrips, audiotapes, and language labs in “direct method” and “audiolingual” classroom over forty years ago, technological innovation has moved from the increased use of cassette tapes, videotapes, and overhead projectors and cameras in the past several decades to the introduction of CD-ROMs and the Internet in the 1990s. The possibilities for computer-enhanced language teaching have most recently been explored in distance education programs as well as in the use of local area networks, computer-assisted reading programs, and web-based classroom activities.Though the use of technology is nothing new in foreign language teaching, its exact role in the curriculum is still being assessed and questioned, particularly in light of the rapidly changing nature of technological aids to instruction. Rather than seeing technology as just another ancillary (助手） to be added to our teaching devices, we need to evaluate its potential for enhancing classroom learning as well as for facilitating (使……便利）student-centered, independent learning outside the classroom. In using technological aids and computer-mediated (计算机为中介的）materials in instruction, we also need to bear in mind the level of proficiency of our students and their ability to benefit from the materials that can be used for them. The use of authentic materials is going to be discussed in more detail in a later section of this chapter and in subsequent chapters.(10分)21.1 This passage is mainly about____.(2分)A. the role technology plays in foreign language learningB. the role technology plays in foreign language teachingC. the role computer plays in language learning and language teachingD. the role technology plays in foreign language learning and teaching
5.
永嘉之乱后，北方边地民族大举内侵，内侵的民族主要有（ ）
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