题目

听材料，回答问题。 （1） What is the man going to do? A . Go to work. B . Have an interview. C . Prepare breakfast. （2） What does Lily do? A . A student. B . A secretary. C . A teacher. （3） What will the woman do this morning? A . Do some housework. B . Go shopping. C . Go to the park. 答案：B A C已知数列{an}满足a1=2，且an+1an+an+1-2an=0，n∈N*，则a2=    ；并归纳出数列{an}的通项公式an=    ．