一、单项选择(本题共15小题;每小题1分,满分15分),从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
( ) 1. This is _______ empty bottle. But it is _______useful one.
A. a; a B. an; a C. an; the D. a; an
( ) 2. It will be bad for your health to eat _______ food and take _______exercise.
A. fewer; more B. more; fewer C. less; more D. more; less