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【简答题】
在一个人工农业生态系统中，玉米、鸡、猪、人组成的食物网如图3所示。鸡、猪、人的粪便以及玉米秸秆通过沼气池发酵，产生的沼气用于照明和做饭，沼渣可以做肥料。请分析回答以下问题! （1）此生态系统中能量流动的起点从__________开始。（2分） （2）在此生态系统中最基本、最关键的生物组成成分是__________。鸡和玉米之间是__________关系。（4分） （3）此生态系统一共有__________条食物链，写出人获取能量最多的食物链__________。（6分） （4）如果工厂排放的有害物质如铅、汞等进入此生态系统．这些有害物质可以通过__________在生物体内不断积累，使其浓度随着消费者级别的升高而逐步增加，这种现象叫生物富集。（3分）
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有权要求税务机关为纳税人、扣缴义务人的情况保密
B.
享有申请减税、免税、退税的权利
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【单选题】You are going to read an article about people who changed their jobs. For questions 23-35, choose from the people (A-D). The people may be chosen more than once. There is an example at the beginning (...
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C.
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相关题目：
【单选题】Nowhere else in Europe ________ people who invite complete strangers to their homes for coffee or dinner. [     ]
A.
you will find
B.
will you find
C.
you have found
D.
have you found
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【简答题】His arm was ________ from the shark’s mouth and reattached, but the boy, who nearly died, remained in a delicate condition. A) retrieved B) retained C) repelled D) restored
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【单选题】Who was considered the “mother of modern American poetry”?
A.
Emily Dickinson
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C.
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【单选题】乳癌病人乳房皮肤出现“桔皮样”改变是由于
A.
癌细胞堵塞皮下淋巴管
B.
癌肿侵犯乳房Cooper韧带
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【单选题】以下哪项技术是提高每个信道上传输信息容量的一个有效的途径?()
A.
光纤孤子(Soliton)通信
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D.
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【多选题】下列关于纳税人、扣缴义务人的权利，表述正确的有（ ）。
A.
有权要求税务机关为纳税人、扣缴义务人的情况保密
B.
享有申请减税、免税、退税的权利
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纳税人因有特殊困难，不能按期缴纳税款的，经省级国家税务局、地方税务局批准，可以延迟纳税．但最长不能超过3个月
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【单选题】---Who has made a mess in my room? ---Who else it but your naughty son?
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【单选题】You are going to read an article about people who changed their jobs. For questions 23-35, choose from the people (A-D). The people may be chosen more than once. There is an example at the beginning (...
B.
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