世界上最高的高原是
A：青藏高原
B：南非高原
C：东非高原
D：巴西高原
“周围一带系沼泽地，建造住宅时，先打下1米长木桩，……其后于地梁上铺设10多厘米厚地板，……其下可用来豢养家畜，地板上为起居住室。”从材料可以推断出所反映的原始人类应该生活在（ ）
根据短文理解，选择正确答案。
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1023个HCl分子，③13.6gH2S，④0.2mol氨气。下列对这四种气体的关系从大到小描述不正确的是（ ）