皮皮学，免费搜题
登录
搜题
【单选题】
A number of econometric studies have found consistent evidence of a hump-shaped relationship between income levels and pollution levels. According to this, as an economy grows and income levels rise:A.
initially the pollution levels remain low
B.
after a while the pollution levels decrease
C.
the pollution levels also rise in proportion to the economic growth
D.
there is increasing industrialization which leads to greater pollution
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】简述小调音乐的艺术特征。
【简答题】简述责任型政府构建的途径。
相关题目：