题目内容
9．According to the novel，Robinson Crusoe had __________ unusual experience on an island．（ ）| A． | / | B． | a | C． | an | D． | the |
分析 根据小说，罗宾逊卡鲁索在岛上有一次非凡的经历．
解答 答案：C．根据题干可知，本句的意思是罗宾逊卡鲁索在岛上有一次非凡的经历．experience表示"经历"时，是可数名词，根据句意可知，本处表示一次经历，是泛指，应用an或a；又根据unusual的音标/?n'ju：?u?l/是元音音素开头的，应用an，故选C．
点评 不定冠词有两个．根据后接单词词首音素的不同采用不同的形式．当词首音素为元音时，用an；当词首音素为辅音时，用a．
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| 18．A．job | B．test | C．phone | D．paper |
| 19．A．caught | B．allowed | C．troubled | D．asked |
| 20．A．mention | B．notice | C．prevent | D．punish |
| 21．A．until | B．before | C．though | D．because |
| 22．A．cleare r | B．easier | C．worse | D．better |
| 23．A．box | B．book | C．homework | D．paper |
| 24．A．believe | B．receive | C．see | D．achieve |
| 25．A．stress | B．complain | C．accept | D．enjoy |
| 26．A．secret | B．idea | C．world | D．dream |
| 27．A．time | B．force | C．money | D．control |
| 28．A．studying | B．working | C．going | D．thinking |
| 29．A．trouble | B．worry | C．fun | D．improvement |
| 30．A．good | B．bad | C．necessary | D．useful． |