I see you got a “D” in biology. _______ ?

—Well. I found that subject hard. I think I will drop it for history.

A．How about that

B．What for

C．How come

D．What’s your next plan

视密度换算过程中，需作温度修正才能求得试样密度的情况是（）

A.温度数值的小数点后为零

B.视密度第四位小数不为零

C.视密度第四位小数为零