由于存在食物的特殊动力效应，进食时应注意

A．增加蛋白质的摄入量

B．调整各种营养成分的摄入比例

C．适当增加能量摄入总量

D．适当减少能量摄入总量

E．细嚼慢咽，以减少这种特殊动力效应

He had his camera ready________he saw something that he would make a good picture.

A even if             B if only           C in case      D so that