Correct: oxygen, hydrogen, chlorine, aluminum, calcium, potassium, sulfur, carbon, helium, argon, neon, Incorrect: air, water, salt, steel, bronze, bananas, brass, electricity, earth, fire, seawater,

Y7 2.5 Whack an element!

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?