为什么分解铁的时候用金属?（why iron is the most extensively use d metal?）

《What is the first metal that man learned to use》 Hard Rock与Metal的区别,为什么要叫金属? the answer is A,tellme why ,why not use B Strike while the iron is hot.为什么用while而不用when why is America the most powerful country? what season is the most dangerous why? why air pollution is the most serious? Strike while the iron is Strike while the iron is hot的意思 the pencil case is made of metal metal划线提问 What do you think is the most ______(use) book? which is the most _____(use) skill to learn