水稻是我省的重要农作物。下列有关水稻田的叙述,正确的是 A.调查

水稻是我省的重要农作物。下列有关水稻田的叙述,正确的

A.调查水稻田中某种害虫卵的密度应用标志重捕法

B.在群落水平上研究,要研究水稻田的范围和边界

C.弃耕后的水稻田上进行的演替速度慢,时间长

D.人们进行除草、治虫等活动的目的是为了提高能量传递效率

答案

B

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