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6．observe vt.观察，注意到；遵守；庆祝 (2008·湖北高考)Though having lived abroad for years，many Chinese still observe the traditional customs. 尽管在国外生活了多年，但是许多中国人仍然遵守传统的习俗。 8．occur vi.发生；(想法，念头等)想起，浮现 [归纳] it occurs to sb. that... ……的念头浮现于某 人脑海 It occurred to me that I would travel South Africa. 我突然想到要去南非旅行。 9．offer v．主动提出，提供；出价 n．提供，出价 [归纳] offer sb.sth./offer sth.to sb. 向某人提供某物 offer to do sth. 主动提出做某事 make an offer of 提议…… In his free time he started eBay as a kind of hobby，at first offering the service free by word of mouth. 作为一种爱好，他业余时间创办了eBay，起初只是口头免费提供一些服务。 10．oppose v．反对，抵制 [归纳] be opposed to 反对，对抗 [拓展] opposite adj. 相反的；对面的 n. 对立面，相反的事物 I thought the medicine would make him sleep，but it had the opposite effect. 我原以为这药会让他睡觉，但效果正好相反。 11．optimistic adj.乐观的 (2008•湖南高考)I admire Helen because she is | 
