若用P代表项目难度，难度越低P值越（）。
A.大
B.小
C.低
D.接近1
参考答案：A
---- How did her family feel when you visited them?
---- My coming ________ the happiness of her family.
A．added up to
B．added up
C．added
D．added to
按照加热温度来划分烟煤的热分解过程主要可以分为（）个阶段。
A.4
B.5
C.6
