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МатематикаВопрос:
13. A) from B) with C) at D) by
Ответ:
13. Предложение "environmental problems are caused ... human activities" требует предлога, указывающего на причину. "Caused by" означает "вызвано чем-либо". В данном контексте, проблемы вызваны человеческой деятельностью.
Ответ: D) by
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