A:to walk; take
B:walking; took
C:to walk; took
D:walking; take
请从氢气、氧气、氮气﹑二氧化碳中选择适当的物质填空:空气中体积分数最大的是____;极易燃烧,被认为是最清洁燃料的是____ ;能灭火的是____ .