一、50.0 mL 含 Ni2+之樣品加入 25 mL 0.050 M EDTA 進行錯合滴定，過量之 EDTA 需以 5.00 mL 0.050 M Zn2+完成逆滴定。請計算樣品之 Ni2+濃度。（20 分）

Ⅲ.You are about to teach an elective course with students of various levels of English proficiency. Some barely comprehend daily conversation; some have already passed the intermediate level GEPT exam. Write a short essay describing what kind of course you could offer and why. Please elaborate on your activities, procedures, and principles of teaching. (20 分)