Information and IdeasHardInference from a timing pattern
Information and Ideas practice question
The town's river runs brown for a day after every heavy rain, but only downstream of the new housing estate; upstream it stays clear. This suggests that ____
Which choice most logically completes the text?
- A. rain is washing soil from the estate's building site into the river.Correct
- B. the river's source is polluted.
- C. the estate's residents pour paint into the river.
- D. the river is always brown.
Answer: A. rain is washing soil from the estate's building site into the river.
Brown only downstream of the estate, only after rain: run-off from the site.
Why the other answers are wrong
- B. the river's source is polluted.
- Upstream stays clear.
- C. the estate's residents pour paint into the river.
- The link to heavy rain points to run-off, not deliberate dumping.
- D. the river is always brown.
- 'Only after heavy rain.'
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