问题
选择题
--- My son seldom has breakfast.
--- It is unhealthy habit. You must ask him to change it.
A．/ ; an
B．the; on
C．/ ; a
D．the; a
答案
答案：A
题目分析：句意：--我儿子很少吃早餐。--那是不健康的习惯。你必须让他改掉这个习惯。分析：一日三餐前不用冠词；下文表示一个不健康的习惯，体现为一个，unhealthy以元音音标开头的，因此用不定冠词a.故选 A