* Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following question.

I could feel his mind trying to probe into my thoughts, to see what I was thinking.

A. research

B. investigate

C. deny

D. take part in

Cho dung dịch muối X vào dung dịch KOH dư, thu được dung dịch Y chứa ba chất tan. Nếu cho a gam dung dịch muối X vào a gam dung dịch Ba(OH)₂ dư thu được 2a gam dung dịch Z. Muối X là

A. NaHSO₄

B. KHCO₃

C. KHS

D. AlCl₃