You’d better go there by train.The train ticket is       the airplane ticket.

A．as cheap three times as

B．as three times cheap as

C．three times cheaper than

D．cheaper three times than

现在很多消费者在购买空调、冰箱等家电时，都会注意产品上的能效标志。（见下图）这一标志主要是标明了家电的能源效率。此标志共分5级，级别越高，耗能越高。消费者关注这一标志表明消费者坚持（）

A.量入为出，适度消费

B.避免盲从，理性消费

C.保护环境，绿色消费

D.艰苦奋斗，勤俭节约