题目内容：
生产力和生物量最大的生态系统类型是( )
A.草原
B.森林
C.海洋
D.农田
参考答案：【答案仅供学习，请勿对照自行用药等】
选择题：生产力和生物量最大的生态系统类型是( )
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- 题目类型：选择题
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生态学的研究内容和范围非常广泛,所以没有特殊的研究对象。( )
生态学的研究内容和范围非常广泛，所以没有特殊的研究对象。( )此题为判断题(对，错)。
It is___________to?stare?directly?at?the?sun
It is___________to?stare?directly?at?the?sunA.harmfulB.harmlessC.comfortableD.safe
Moviegoers know that many special effects are created by computers, they often d
Moviegoers know that many special effects are created by computers, they often don' tknow is that the
__ is known to the world, Mark Twain was a great American writer.
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Most people tend to agree _________ one thing :taxes are too high
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