问题 填空题

已知等比数列{an}的各项都为正数,它的前三项依次为1,a+1,2a+5,则数列{an}的通项公式an=(    ).

答案

3n﹣1

写作题

假设你是李华,Peter是你的笔友。随着国庆节的来临,他们一家准备来中国旅游。请你给他发封邮件,推荐景点及出行方式。

注意:

1.字数100左右;

2.可以适当增加细节,以使行文连贯;

3.开头和结尾已为你写好,不计入总词数。

Dear Peter.

I’m so glad to learn that you and your family are coming to visit China.

                                                                           

                                                                           

                                                                           

                                                                           

                                                                           

                                                                           

                                                                           

                                                                           

                                                                           

                                                                           

                                                                           

Looking forward to seeing you!                                     

Yours,

Li Hua

单项选择题