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Craft and StructureEasy–MediumFunction of a counterfactual final sentence

Craft and Structure practice question

The town's Roman bridge still carries traffic. Its secret is its shape: the arch pushes each load outward into the abutments, so the stones are always in compression, which stone withstands well. A flat span of the same stone would have collapsed within a generation.

Which choice best describes the function of the final sentence?

  1. A. It emphasises the arch's advantage by describing what a different design would have done.Correct
  2. B. It describes a second bridge in the town.
  3. C. It contradicts the claim made in the second sentence.
  4. D. It explains what compression is.

Answer: A. It emphasises the arch's advantage by describing what a different design would have done.

By imagining a flat span that would have failed, the last sentence makes the arch's durability stand out.

Why the other answers are wrong

B. It describes a second bridge in the town.
No second bridge exists; the flat span is hypothetical.
C. It contradicts the claim made in the second sentence.
The sentence reinforces the second sentence's point.
D. It explains what compression is.
Compression is explained in the second sentence, not the last.

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