Свет как электромагнитная волна. скорость света. интерференция света: опыт юнга; цвета тонких пленок.

Cat sare (nicer) than lizards. dolphins are (cleverer) than whales. giraffes are (thinner) than hippos. its (hotter) in summer than in autumn. lena is (prettier) than tamara. gena is (friendlier) than artyom