The only existing problem is ____ we can find this special wood in the forest in such a short time.

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• Much to the couple’s comfort, their income is now double ________ it was five years ago. A．thatB．tha
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• 进行无土栽培时应适时更换营养液，目的是为植物的生长提供充足的（）A．水B．无机盐C．有机物D．氧气-八年级生物
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• — How do you usually find out about new software? — In the magazines like Popular Electronics. That&
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• 某同学在研究蚕豆叶片上、下表皮气孔密度(单位面积气孔数目)时，采用了以下三种方案进行实验：方案一：用显微镜观察同一张蚕豆叶片的上、下表皮装片。方案二：把新鲜的蚕豆叶片-九年级生物
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