量热法依据的原理是（）

A.化学特性

B.生物效应特性

C.热作用

D.荧光作用

E.电离作用

—The boss said we had only three days to finish the work.

—Don't worry.We have already________two thirds of it.[ ]

A. got down  

B. got through

C. given in  

D. given away