If we go on using energy so wastefully, __________ are that our oil wells will be dried up before new energy sources can be found to replace oil.

A．chances

B．opportunities

C．questions

D．problems

肝掌的出现可能与下列哪项有关

A．毛细血管扩张

B．胆盐刺激皮肤

C．血管通透性改变

D．雌激素过多

E．以上都不是