单选题 Agriculture today has had the luxury of being able to pollute and {{U}}alter{{/U}} the landscape first and worry about the consequences later.

A、 transform
B、 reform
C、 perform
D、 conform

【正确答案】 A

【答案解析】[分析] 动词辨析 alter改变；例：The city centre has altered beyond recognition．市中心已变得认不出来了。而A．transform转换，改变，改造；B．reform改革，革新；C．perform履行，执行，表演； D．conform使一致，使遵守。所以答案为A。