Cho các thuốc thử sau: dd KMnO₄, dd KOH, dd AgNO₃, Fe, Cu. Số thuốc thử có thể dùng nhận biết Fe²⁺, Fe³⁺ là

A. 2

B. 3

C. 4

D. 5

Reporter : What's your name?

Mai : My name is Mai

Reporter : How old are you?

Mai : I'm thirteen

Reporter : Where are you from?

Mai : I'm from Hue

Reporter : Which language do you speak?

Mai : I speak Vietnamese

Reporter : Which school do you go?

Mai : I go to Nguyen Du school

Reporter : Which grade are you in?

Mai : I'm in grade 6

Mark the letter A, B, C or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. nourish                                   

B. flourish                     

C. courageous         

D. courage