题目内容
15．English isa （a/an） useful subject．分析 英语是一门有用的学科．
解答 答案：a 考查单词填空．根据题干：本题主要考查不定冠词a （an）与数词one 同源，是"一个"的意思．a用于辅音音素前，而an则用于元音音素前，useful 首字母音标是辅音音素，所以要用a．
点评 解答此题的关键是根据语境推测要填内容表达的含义，然后能理解各选项内容，有时可能没有必要细细区分每个单词的含义，仅根据句子语气就可以判断出正确答案．
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