"Miss Zhou is a woman, and she asked the math teacher a question" means that she is not a math teacher, nor a foreign language teacher (XX's brother), but a Chinese teacher. "Mr. Shen's classes are all in Chinese" means that he is not a foreign language teacher, but a math teacher. The rest of Miss Liu is a foreign language teacher. Namely: Zhou-Chinese, Shen-Mathematics, Liu-Foreign Language.
4, analyze it. "Little English got the first place in Chinese", and the first places in English and mathematics can only be Xiao Ming and Xiao Liang. "Xiao Ming is second in math", then he can't be first in math, only first in English.