23.economical和economic
economic“经济学的，经济上的”an economic survey of Scotland苏格兰经济调查；an economic block.ade经济封锁；economical“节俭的，经济的”；Hes had t0 learn to be more economical now that his only in.come is a small pension.
24.historical和historic
historical“有关历史的”，“历史的”，the historical period历史阶段；historical personage历史人物。‘historic“历史上有名的，有历史意义的”，historic town历史名城。
25.infer和imply
infer“猜想，臆测”，“推断”；infer a motive from an effect从效果推知动机。
imply“含有……的意思”；Do you realize what his words imply?你理解他说话的含意吗？I do not imply that you are wrong.我的意思不是说你错了。
26.intense和intensive.
intense“激烈的，强烈的”，“紧张的”an intense light强烈的灯光；intense heat酷热；an intense life奋发图强的生活。
intensive“加强的，集中的”；“深入细致的，彻底的”；an intensive bombardment密集炮击；an inten-sive study彻底的研究；an intensive reading精读（opp.Extensive reading泛读）.
27.apt和prone
它们都具有“tending to 0r in the habit of¨的意思，但是prone只用于人。Elderly people are prone t0 falls，often because of arthritic joints or dizziness.
28.100se和lose
loose”松的，宽的“.
lose”丢失“；lose oneg balance失去平衡，跌倒；lose oneg head被搞糊涂。
29.magical和magic
它们都和magic有关系，但是magical也有”wonderful，entrancing’的意思。
30.masterly和masterful
masterly（showing great skill or the skill 0f a master）“熟练的；名家的”.
Masterful（showing power or authority）“主人派头的，专横的”；Youie so strong and masterful.