第一节 单项填空（共15小题；每小题1分，满分15分）
从每小题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
Beginning college is exciting: many of us can be easily at a loss by _______ details of
running ______ well-balanced life.
A. /; the                    B. the; a                C. /; a                           D. the; /