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答案 1./ [as引导的让步状语从句的名词前不加冠词。] 2.the [形容词或副词的最高级前用定冠词。] 3./ [名词的复数形式前不加冠词，表示泛指。] 4.a [由物质名词转为个体化的可数名词前加不定冠词表泛指。] 5.an [以元音开头的单词前，加不定冠词an，表示泛指。] 6.the [表示计量的名词前加定冠词the，若为抽象名词则不加定冠词，如by weight...] 7./ [球类运动前不加定冠词。] 8./ [表称谓的名词作表语，宾补或同位语时，不加冠词。] 9.a [a＋序数词表示“……分之一”。] 10.a [抽象名词具体化，可加不定冠词，如：a success一个失败的人(事)。] Ⅲ.正反探究 1.【误】We stood at the top of the mountain the east of the city，watching a burning sun rising. 【正】We stood at the top of the mountain east of the city，watching a burning sun rising. 解析 定冠词用于介词短语中的方位名词前。注意：在没有介词的方位名词前，不用冠词。 2.【误】As a rule，the workers are paid by an hour. 【正】As a rule，the workers are paid by the hour. 解析 用于by the dozen/gallon/ ton/yard/ year/month/day/hour等结构中表示计量单位，意为“按/以……(卖/租/付款)”，常与buy，sell，rent，charge等动词连用。 3.【误】She is a newcomer to the chemistry but she has already made some important discoveries. | 
