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【单选题】Can trees talk Yes, but not in words. Scientists have reason to believe that trees do communicate with each other. Not long ago, researchers learned some surprising things. First, a willow tree attack...
A.
touching one another
B.
C.
B. smelling one another
D.
C. making unusual sounds
E.
D. making special movements
【单选题】瘤胃是良好的天然 “ 发酵罐 ” ,其具有的特点有( )。
A.
有水和食物不断进入， 节律运动和适宜温度
B.
有充足的氧气供给
C.
高度厌氧
D.
PH 6.0-7.0