_________the authorities continue to crack down football betting _________a new hope in the future.

A．If only; Chinese soccer can see

B．Only if; can Chinese soccer see

C．Even if; can see Chinese soccer

D．Only if; see Chinese soccer can

陈鹤琴对自己的儿子做了数年的观察，写出《儿童心理之研究》，这属于（）

A.典型研究

B.横向研究

C.纵向研究

D.常规研究