Microsoft Word psat sample items with explained answers master

Key: A  

 

 

Justification: 

The passage explains how bacteria start to become drug-resistant, and how resistance 

increases with repeated treatments. It follows from this that if antibiotics are used too often, 

they will cease to be effective treatments. 

Distractors

  

B

 is too general, and too extreme. It goes beyond the specific case of antibiotics.  

C

 might be thought to follow from the first sentence of the passage, but the author neither 

says nor implies anything about the comparative effectiveness of treatments.  

D

 is sometimes claimed in connection with this topic, but it is not supported by this particular 

passage.