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机体内部存在着普遍的联系,经络是机体内部各种联络模式的总和。( )
A.对
B.错
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Ginger and Rocky had a discussion about life outside the chicken farm. Ginger was eager to escape from the chicken farm for many reasons, among which one of them was to ___________.( ) A. feel grass beneath her feet B. climb the hills C. eat greener grass D. hatch her eggs
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当水体中各种形态氮共存时,初级生产者优先选择利用的氮的形态为( )。
A.氨态氮
B.亚硝态氮
C.硝态氮
D.氮气
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