All the donated money should be made full use _______the homeless people in Ya'an city of Sichuan province.

A．of helping

B．to help

C．of to help

D．to helping

可以引起牙痛的全身疾病不是（）

A.缺血性心脏病

B.神经衰弱

C.白血病

D.颈椎病

E.癔病