题目内容
The barriers that are caused by taxes on imports and exports of goods called as ___________()
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The________barriers are consist of trade include quota and embargo by national regulations, and exchange controls.()
The environmental awareness established at high level in ________ ________ countries.()
The reduction of the capacity of the environment to meet social and ecological objectives and needs called as ____________()
Floods, quakes, tidal waves, storms, and wildfires are _________ causes of ecological damage()
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