情景交际。根据下列情景，选择正确答案。
1. 当你想对别人说“祝你身体健康！”时，应说：[ ]
A. Happy birthday to you!
B. Good health to you!
C. Good work!
2. 当老师或家长对你说“在学校要努力学习。”时，应说：[ ]
A. Work hard at school.
B. Work hard at home.
C. Work hard at sports.
3. 当你想对别人说“干得漂亮或做得好！”时，应说：[ ]
A. Do good!
B. Do beautifully!
C. Good work!
4. 当老师问你“多长时间进行一次锻炼？”时，应说：[ ]
A. How long do you exercise ?
B. How often do you exercise ?
C. How long are you exercise ?
5. 当家长对你说“早饭前要洗脸，饭后要刷牙。”时，应说： [ ]
A. Wash your face before breakfast and comb your hair after it．
B. Wash your face before breakfast and brush your teeth after it.
C. Wash her face before breakfast and brush her teeth after lt.
时，它沿斜面下滑的距离是[ ]
