A small part the population are believed to have no           to the health care in the west rural area

of the country.   [    ]

A. aid      

B. basis        

C. access    

D. belief

内力作用的能量主要来自：[ ]

A．地球内部的热能

B．太阳辐射能

C．地球表面的水能

D．大气运动的风能