Have you ever known the mobile phone has a _______ history? It is said that the world’s
first mobile phone was made in the 1970s.
A:long
B:fresh
C:colourful
D:different
根据短文理解,选择正确答案。
We talked to 300 people. One hundred were from 11 to 18 years old. One hundred were from 19 to 26. One hundred were 27 to 35 years old. We asked them what they like to do on weekends. Please look at the chart.
Favourite things to do (by age).
已知数列{an}满足a1=2,an+1=an+2,则a16=____