正确答案: A

水稻害虫密度将下降 能量流动的营养级数减少 水稻固定的太阳能增加 物种多样性上升

题目：假设将水稻田里的杂划全部清除掉，稻田生态系统中

解析：C

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学习资料的答案和解析：

[单选题]CSports can help you keep fit and get in touch with nature. However, whether you are on the mountains, in the waves, or on the grassland, you should be aware that your sport of choice might have great influence on the environment.

Cycling around a lake.

[单选题]筛管分子间有穿孔相通，其中有联络索通过。( )

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