在科学研究和社会调查中，常采用五点取样法，正确的五点取样法是（）-七年级生物

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• （每空2分，共8分）“探究影响鼠妇分布的环境因素”是我们学习生物学的第一个探究实验，通过实验，让同学们了解探究实验的一般过程，体会控制变量和设计对照实验的重要性。请你根-七年级生物
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• (2010日照)3.科学家把美洲拟鲽抗冻蛋白质基因转入西红柿，成功培育出了抗冻西红柿。科学家把上述基因转入西红柿所利用的生物技术是A．组缎培养B．嫁接技术C．发酵技术D．转基因-七年级生物
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