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实行间作和混作可以提高复种指数。()

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我国低产田的主要原因是干旱、涝洼、盐碱与土层薄。()

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菱角原产于中国。()

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According to Sir Richard Paget, the right order of development of human communication

A. sounds, food, hunting, writing, gambling, online chatting
B. gestures of the hands, gestures of the mouth, whispered speech, voiced speech
C. gestures, eye movements, writing, speech, telegraph, internet
D. shouting, whispers, hands movements, horse riding, computers

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植物体内磷大部分存在于籽粒中，而钾的绝大部分在茎秆中。()

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