Trung hòa 1 mol α-amino axit X cần 1mol HCl tạo ra muối Y có hàm lượng Clo là 28,286% về khối lượng. CTCT của X là

A. H₂N-CH₂-CH₂-COOH

B. CH₃-CH(NH₂)-COOH

C. H₂N-CH₂- CH(NH₂)-COOH

D. H₂N-CH₂-COOH

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position ofprimary stress in each of the following questions.

A. popularity

B. personality

C. hospitality

D. apprentice

You should be a little more _________  if you want to attract their attention.

A. imaginative     

B. imagine   

C. imagination      

D. imaginatively