What shocked the world was the fact _____challenger crashed just minutes after take-off. [ ]A. which

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• 植物生活中需要最多的三类无机盐是（）A．氮、磷、钾B．氮、磷、铁C．氮、硫、钾D．硼、磷、锌-八年级生物
• 植物需要量最大的无机盐是（）A．氮、磷、钾B．钾、钙、镁C．铁、硼、钾D．钠、钾、铁-七年级生物
• 给庄稼、花草施肥对植物生长的意义（）A．为庄稼、花草提供充足的水分B．为庄稼、花草提供无机盐C．为庄稼、花草提供足够的有机物D．以上三项都正确-生物
• 种植农作物时，最好施用的肥料是（）A．氨肥B．磷肥C．钾肥D．农家肥-生物
• 无土栽培是指（）A．植物浸在水里的栽培B．无需无机盐的栽培C．在配制好的营养液中栽培D．浸在农家肥里的栽培-生物
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• 植物生长需要量最多的无机盐是（）A．含氮、磷、钾的无机盐B．含氮、磷、铜的无机盐C．含钙、磷、钾的无机盐D．含氮、锌、钾的无机盐-生物
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• 无土栽培是栽培植物的新技术，青菜在无土栽培的培养液中也能茁壮成长．下列有关叙述中，不正确的是（）A．培养液的浓度大小不会影响青菜对水的吸收B．配制的培养液的主要成分与土-生物
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