— Why does he never pick up the waste paper on the ground?

— Maybe because he thinks it’s beneath his         to do so．

A．honesty

B．dignity

C．property

D．quality

原始地球条件下，最初生成有机小分子物质和有机大分子物质的场所依次是 [ ]

A．原始大气、原始大气    

B．原始海洋、陆地   

C．原始大气、原始海洋    

D．原始海洋、原始海洋