今日の読み物　レベル13

◇英検２級の読解問題から

Ozone Depletion The primary cause of the hole in the Earth's protective ozone layer is a group of man-made chemicals used in refrigerators, air conditioners and plastic foams. The chlorine released when these compounds decompose destroys ozone, letting dangerous ultraviolet light from the...レベル13 [英検１級リスニング]