Mark the letter A, B, C or D to indicate t...

Câu hỏi: Mark the letter A, B, C or D to indicate the word/phrases SIMILAR in meaning to the underlined word(s) in each of the following questions.

A. a thing that you do often and almost without thinking

B. the place where a particular type of animal or plan is normally found

C. a subject that students don't understand 

D. a theme that everyone likes to discuss