植物需要的无机盐[]A．由叶吸收B．主要由根吸收C．茎和根共同吸收D．根茎叶都可以吸收-八年级生物

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• Not until I read your letter ________ the true state of the affairs.A．did I understandB．had I unders
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• 种庄稼需要施肥，肥料的作用是给植物的生长提供[]A．有机物B．水C．无机盐D．氧气-七年级生物