题目内容
19．Kate is girl．She's very happy at school．（ ）| A． | a eighteen-year-old | B． | an eighteen-year-old | ||
| C． | an eighteen-years-old | D． | a eighteen-years-old |
分析 凯特是个十八岁的女孩．她在学校很高兴．
解答 答案：B 此题考查合成词的用法．根据Kate is…girl可知所缺的词应该作girl的定语修饰girl；结合合成词的用法，作定语应该用带有连词符的合成词，且构成单词一般都要用原形．根据这一用法，可以排除C、D因为years不能加s；．又因为eighteen-year-old的开头的发音是元音，所以应该用冠词an，故选B
点评 做此类合成词的题目，关键是确定其在句子中所充当的成分；其次要注意带有连词符号的合成词的正确表达形式以及冠词的正确用法
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