题目

已知数列的通项公式an＝ (n∈N*)，求数列前30项中的最大项和最小项． 答案：解：∵an＝1＋，∴当n≤9时，an随着n的增大越来越小且小于1，当10≤n≤30时，an随着n的增大越来越小且大于1，∴前30项中最大项为a10，最小项为a9. Mr. Johnson tried to get rid of the man who ____ him but in vain.     A. had followed     B. has followed           C. was following         D. would follow