近义词：dear=costly=pricey
反义词：cheap=inexpensive adj.便宜的，廉价的；
（2019年，浙江卷，阅读B）
30. How can we do trampolining safely? A. Buy an expensive trampoline. B. Jump in the center of a trampoline. C. Choose a trampoline without a net. D. Lose weight before starting trampolining. 20. experience
n.经验；经历；v.经历
关联词组：by experience凭经验；working experience工作经验；rich experience丰富的经验；past experience过去的经验 用法：
1experience表示“经验，体验”时，为不可数名词：She had no experience of life at all.她毫无生活经验。 ○
2experience表示“经历，阅历”时，为可数名词：Tell us about your experiences in Africa.给我们讲讲你在非○
洲的经历。
（2019年，北京卷，阅读A）It was a lifetime experience. I was able to experience Chinese living and culture from basic Tai Chi to Beijing Opera. 21.explain
v.解释，说明
用法：常用句式为explain sth. to sb.向某人解释某事；explain +that从句；explain后面也可以接反身代词，即explain oneself，表示“把自己的意思表达清楚”或“解释自己的行为”。
词性转换：explanation n.解释，说明（注意：explain变名词，并不是直接加-ation）
（2019年，山东卷，完形）
To show the respect, it may be ____12____ to explain what the gift is. 12. A. necessary B. careful C. comfortable 22. express
v.表达，表述
关联词组：express oneself表达自己的思想；express thanks to sb.向某人表达感谢
熟词僻义：n.快递；快速：express way快车道，高速路；express train快速列车；by express通过快递邮寄 词性转换：expression n.表达；表情：facial expression面部表情；beyond expression无法表达，形容不出
（2019年，浙江卷，阅读B）
21. Why does the writer quote(引用) a story in Paragraph 3? A. To explain Africans like sweets. B. To show examples are not enough- C. To make the writer's opinion clearer. D. To express happiness is from children.
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