你认为以下哪个塑胶购物袋的环保征费水平能够有效令市民减用购物胶袋？
Which of the following levy on plastic bags is an effective deterrent level to reduce the use of plastic shopping bags?
你认为以下哪个塑胶购物袋的环保征费水平能够有效令市民减用购物胶袋？
Which of the following levy on plastic bags is an effective deterrent level to reduce the use of plastic shopping bags?
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