题目1：找出数字之间的规律，然后算出最后一个数字是多少？
3， 7， 12， 15， 9， -18， ( )
A. -27 B.-45 C.-81 D.-102
题目2
https://i.imgur.com/7CxI7rB.jpg
题目3
https://i.imgur.com/crxNZf4.jpg
题目4
https://i.imgur.com/Fm9Ya1R.jpg
题目4的选项
https://i.imgur.com/hKce4Tt.jpg
题目5
https://i.imgur.com/iNnbqmK.jpg
题目6
https://i.imgur.com/wKRRUEM.jpg
题目7
https://i.imgur.com/4g2ggjS.jpg
题目8
https://i.imgur.com/BlZbGBr.jpg
题目9
https://i.imgur.com/3Vfc89G.jpg
题目10
https://i.imgur.com/nb2hTOM.jpg
题目11
https://i.imgur.com/QDQDJWV.jpg
题目12
https://i.imgur.com/K6pY2C5.jpg
题目13
https://i.imgur.com/nEmgggQ.jpg
题目14
https://i.imgur.com/nMfueRG.jpg
题目15
https://i.imgur.com/Fv2nG3W.jpg