A, Xiaoming's home-supermarket-library,
Xiaoming's family shop library,
C, Xiaoming's home-Xiaoguang's home-shop-library,
D, Xiaoming's home-Xiaoguang's home-zoo-library
Xiaoming's home-shop-Xiaoguang's home-zoo-library,
(2) Xiaoming is closest to the library from home through the shop.
109+69= 178 (m),
A: Recently, it was178m;
(3) A questionable question: How many meters does Xiaoguang walk from home to the library through the store?
88+69= 157 (m);
A: Xiaoguang has to walk 157 meters from home to the library and cross the store.