2015年6月大学英语四级备考：选词填空技巧四

英语自学网

　　答题技巧四：
        　　利用不定冠词(a/an)判断考点是否为元音开头，缩小选择范围
        　　Sample: Husband and children now do some of these jobs, a ____ that has changed the target market for many products.
        　　(scale, potential, gap, extreme, purchase, situation)