A：二氧化碳、一氧化碳均能使紫色石蕊溶液变红
B：一定温度下C和CO均可将氧化铜还原成铜
C：金刚石、石墨完全燃烧均生成二氧化碳
D：石灰石、大理石都可与稀盐酸反应
The skin, an ________ part of your body and its largest organ, ________ as a barrier against diseases.
— Let's join the chess club.
— That sounds ____ (well).
