Wind power is an ancient source of energy ______________we may return in the near future. [ ]

A. on which      

B. by which      

C. to which        

D. from which

中央动脉阻塞的抢救措施包括（）.

A.按摩眼球，降低眼压

B.纤溶制剂溶栓

C.治疗原发病，高血压者降血压

D.吸氧

E.舌下含化硝酸甘油和其他血管扩张药物的应用