一、多样表达
1．缺席：absence → 在场：presence
2．丰富：abundance → 缺乏：lack
3．接受：accept → 拒绝：refuse
4．活着的：alive → 死的：dead
5．承认：admit → 否认：deny
6．反对：be against → 支持：be for
7．不同的：different → 相同的：same; alike
8．分开：apart → 一起：together
9．允许：allow → 禁止：forbid
10．使烦恼：annoy → 使满意：satisfy
11．同意：agree → 不同意：disagree, refuse
12．人工的：artificial → 自然的：natural
13．攻击：attack → 防守：defend
14．噩运：bad luck → 好运：fortune, good luck
15．仔细的：careful → 粗心的：careless
16．复杂的：complicated → 简单的：simple
17．空的：empty → 满的：full
18．干燥的：dry → 潮湿的：wet, humid
19．昂贵的：expensive → 便宜的：cheap
20．慷慨的：generous → 吝啬的：mean
