---- What do you think of the lecture made yesterday?

---- Excellent! _______ you missed such a wonderful lecture?

A．How is it that

B．Why it was that

C．How was it that

D．When was it that

人们常用水给汽车发动机降温，这是因为水的_________较大；在这个过程中是通过_________的方式使水的温度升高，内能增大。图反映的是汽油机工作时的_________ 冲程。