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食物链是生态系统中能量和信息流动的主要通道。()

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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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食物链是生态系统中能量和信息流动的主要通道。()

实行间作和混作可以提高复种指数。()

我国低产田的主要原因是干旱、涝洼、盐碱与土层薄。()

菱角原产于中国。()

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