A:it was whe
B:it was that
C:was it whe
D:was it that
下面句子中字形和字音均正确一项是( )
下面有四个结论:①偶函数的图像一定与y轴相交。②奇函数的图像不一定过原点。③偶函数若在0,+∞上是减函数,则在-∞,0上一定是增函数。④有且只有一个函数既是奇函数又是偶函数。其中正确结论的个数是( )
Tom wants to be a singer and he singing lessons to do it.