PrepTest 132, Section 1, Question 17
Passage A Because dental caries (decay) is strongly(485 more words not shown)
Passage A(220 more words not shown)
Passage B(273 more words not shown)
Passage B most strongly supports(13 more words not shown)
- AThey can either(12 more words not shown)
- BThey are typically(9 more words not shown)
- CThey have a(11 more words not shown)
- DThey contribute to(7 more words not shown)
- EThey increase the(4 more words not shown)
Reading the passage
Fiber and grit affect tooth wear. It's tempting to read less wear as healthier teeth, but we need to trace what the wear actually does. B first explains how wearing the crown can remove food traps, then adds a qualification about severe wear.
Working the answers
- ACorrect
Some wear removes fissures that trap food, limiting decay. Too little fiber or grit may reduce that protective wear. But severe wear can expose the pulp cavity and contribute to decay. That explains how fiber and grit can help or hurt depending on their prevalence: the effect isn't simply more wear equals worse teeth.
- B
No comparison establishes that people typically consume more fiber and grit as they adopt agriculture. B explains a possible effect of changes in wear, not this general trend in consumption.
- C
We aren't told that they have no nutritional value or that they damage overall health. The discussion concerns their effect on teeth.
- D
This reverses the stated mechanism. Wear can remove fissures; fiber and grit aren't described as creating them.
- E
Nothing says they make carbohydrate-rich foods stickier. Stickiness and the wearing away of tooth surfaces are different parts of the explanation.
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