The passage mainly discusses the factors leading to plastic bag pollution.. In Ireland, following the collection of a 15 euro c

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问题 The passage mainly discusses the factors leading to plastic bag pollution..
In Ireland, following the collection of a 15 euro cent per bag tax, plastic bag usage has dropped by ______.

选项

答案90 percent

解析 参见“Pollution Taxes & Bans”部分第二段。
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