—The hotel business in China is as __________ as that in developed countries now.

—Yes, but we still have a long way on energy saving hotels.

A．innocent

B．curious

C．perfect

D．mature

锅炉主蒸汽压力调节系统的作用是通过调节燃料量，使（）与（）相适应，以维持汽压的恒定。