People laugh at jokes, but seldom ________ about how they work.A．they thinkB．think theyC．they do thi

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• 植物生长中需要量最多的无机盐是[]A．含氮的、含磷的、含钾的无机盐B．含氮的、含磷的、含铁的无机盐C．含硼的、含磷的、含钾的无机盐D．含氮的、含磷的、含锌的无机盐-七年级生物
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