公羊效应是指经常与公羊混养的母羊与长期隔离的母羊相比,其发情期()。
A、相同
B、长
C、短
D、不确定
参考答案:C
The actress received an award for her ________ to charity work.
A.addiction
B.devotion
C.allowance
D.application
补体活化替代途径开始于( )
A.C1的活化B.C2的活化C.C3的活化D.C4的活化E.C567