Customs clearance strategy:
Question: In math class, Xiao Hang read a comic book in the textbook, and the teacher found it immediately. How did the teacher find out?
Answer: touch the mouth of the stone pit.
The troubles of stone pits 4. Complete customs clearance.
Level 1 level 2 level 3 level 4 level 5 level 6 level 7 level 8 level 9 level 10 level 13 level 14 level 15 level 16. 0 Guan 22 Guan 23 Guan 24 Guan 25 Guan 26 Guan 27 Guan 29 Guan 30 Guan 3 1 Guan 32 Guan 33 Guan 34 Guan 35 Guan 36 Guan 37 Guan 39 Guan 40 Guan 4 1 Guan 42 Guan 43 Guan 44 Guan 45 Guan 46 Guan 47 Guan 48 Guan 55, 56, 57, 58, 59.