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随着水体富营养化程度日趋严重，淡水湖泊藻类水华频繁发生。人工打捞和投放大量化学杀藻剂进行紧急处理是常用的治理方法。近年来，研究者采用投放食浮游植物的鱼类和种植大型挺水植物构建生物修复系统的方法，收到较好的效果。根据上述材料回答问题：在该修复生态系统中，主要生产者是（）和（），鱼类属于该生态系统的（）。
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【单选题】Checks and balances systemChecks and balances system was based on division of powers. Congress is the Legislative branch. It consists of two chambers: the Senate and the House of Representatives.The E...
A.
Congress consists of two chambers: the Senate and the House of Representatives.
B.
Three branches are completely isolated from one another.
C.
The Judicial branch is composed of the Supreme Court and 11 court of appeals.
D.
The President can not veto the bill.
【单选题】— Is it _____ the bad smell that is difficult ? — Of course. A. B.
A.
how getting rid of
B.
got rid of
C.
to get rid of
D.
being got rid of
【单选题】Checks and balances systemChecks and balances system was based on division of powers. Congress is the Legislative branch. It consists of two chambers: the Senate and the House of Representatives.The E...
A.
Executive.
B.
Legislative.
C.
Judicial.
D.
Supreme.
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