A. What should I do B. Thank you, mom. C. Where have you been D. Yes, he is. E. What was wrong with him F. Were you sick G. Where is the hospital H. I’m sorry to hear that.
A. a waste of money B. a waste of time C. an expression of taste D. an expression of creativity
A. 改善营养 B. 更换水源 C. 移民 D. 水中除氟 E. 投药
A. 对 B. 错