人们通常把尽可能减少二氧化碳排放的生活方式称为低碳生活。低碳生活离我们很近，把白炽灯换成节能灯、使用环保购物袋、教材循环利用、废物再利用善等都能减少二氧化碳排放。这说明 [ ]

①消费行为会对社会经济产生影响 ②家庭要超前消费，防止消费滞后 ③要改变消费习惯，提倡绿色消费 ④低碳生活要导致消费球平的降低

A．①②

B．①③

C．①④

D．③④

Which of the following is least likely to be considered a reason why regulation of monopolies is not effective（）

A. Regulators do not know the firm’s cost structure.

B. Regulation shifts industry demand and increases prices.

C. Regulation reduces the incentive for firms to reduce costs.