一、 单项选择（共20分，每小题1分）
从下列各题所给的四个选项中选择可以填入空白处的最佳选项。
( )1. To keep healthy, we should eat more vegetables and less _____.
A. food B. drink C. meat D. wine
( )2. The policeman helped the old man _____ the street.
A. across B. over C. through D. above
( )3. _____ this kind of pear, and you will like it.
A. To try B. Trying C. Try D. Tried
