"无阴则阳无以化，无阳则阴无以生"，说明了下列何种关系（）
A.阴阳对立
B.阴阳互根
C.阴阳消长
D.阴阳转化
E.阴阳交感
参考答案：B
所有的动物都属于生态系统中的消费者．______．
In order not to disturb his research,his wife__________the news of her sickness. [ ]
A. turned back
B. turned out
C. held back
D, held out
