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.
More than half a century after antibiotics transformed modern medicine, their effectiveness continues to decline in ways that many researchers find deeply troubling. A recent multinational report, which examined prescribing data from over 150 healthcare systems, introduced a measure called “selection pressure”, a concept that takes into account not only how often an antibiotic is prescribed but also (18)__________. When researchers compared data from 2014 to 2023, they found that resistance rates had risen across several major bacterial groups, a pattern that suggests mounting strain on public health systems.
The rise in antibiotic resistance is linked to two interrelated developments: clinicians are relying on larger volumes of antibiotics, and (19)__________, a shift that has been driven by the rapid spread of resistant infections. As resistance intensifies, health systems that depend heavily on pharmaceutical treatment often feel compelled to adopt broader-spectrum drugs, which, although effective in the short term, (20)__________. Certain antibiotic classes, particularly fluoroquinolones and third-generation cephalosporins, have attracted growing concern because of the selective pressure they exert across a wide range of pathogens.
Efforts to reduce unnecessary antibiotic use, while widely supported, involve difficult trade-offs, (21)__________, thereby increasing the likelihood of complications in vulnerable patients. Although many countries have pledged to curb inappropriate antibiotic use by 2030, (22)__________, leaving specialists concerned that current policy frameworks may be inadequate to the scale of the problem.
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