在家畜的发情周期中,其中哪一阶段又称为黄体生成期()。
A、发情前期
B、发情期
C、发情后期
D、休情期
参考答案:C
The futility of the program resulted from poor planning.
A.possible failure in the future
B.ineffectiveness and uselessness
C.blindness to its mistakes
D.potential disaster
简述智力发展的个别差异。