题干
�. Evidence came up ________ specific speech sounds are recognized by babies as young as months old.
A：that
B：whose
C：which
D：what
答案(点此获取答案解析）
A
A：that
B：whose
C：which
D：what
在（
，+
）内有定义．对于给定的正数K，定义函数
，取函数
=
．若对任意的
，恒有
=