http://mail.yandex.ru/message_part_proxy/Lightning%20PG.pps?hid=1.2&ids=2110000001646621814&name=Lightning%20PG.pps&filetype=ppt
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The photo of a thunder-storm is taken from the Internet http://mail.yandex.ru/message_part_proxy/Lightning%20PG.pps?hid=1.2&ids=2110000001646621814&name=Lightning%20PG.pps&filetype=ppt | |||