Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered...
Đề bài
Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.
Question 18:
A. how severely each substance affects a range of bacterial populations
B. which bacterial populations are severely affected by each substance
C. how much damage is done by bacteria to each substance used
D. each substance affects a range of bacterial populations severely
