Amino axit X có phân tử khối bằng 75. Tên gọi của X là

A. lysin

B. alanin

C. glyxin

D. valin

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions from 24 to 25.

Several chapters of Joan Steer’s book describe illegitimate gambling activities in California in the 1970s.

A. lawful

B. unusual

C. prosperous 

D. prohibited