单选题

(2019·辽阳市高三二模)下列实践活动中的相关措施或方法不科学的是()

A. 调查野外某些小动物种群密度时,可以采用样方法
B. 研究生物多样性的间接价值,可以从森林和草地对水土的保持作用等方面入手
C. 在油菜花期喷洒一定浓度的2,4­D溶液可防止连续阴雨天气造成的减产
D. 在农田中放养适量的青蛙和无毒蛇,可以达到防治害虫、维持生态平衡的目的

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