16Hit1600
Expression of IdeasMediumSynthesis: stating a change over time

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - The Skerry lighthouse was built in 1811. - Its original lamp burned whale oil and was visible for 9 nautical miles. - The lamp was converted to paraffin in 1874. - The current electric lamp, fitted in 1961, is visible for 18 nautical miles. - The lighthouse is still a working light.

The student wants to show how the light's range has changed. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. The Skerry light's range has doubled, from 9 nautical miles with the original whale-oil lamp to 18 with the electric lamp fitted in 1961.Correct
  2. B. The lamp was converted to paraffin in 1874.
  3. C. The Skerry lighthouse was built in 1811.
  4. D. The lighthouse is still a working light.

Answer: A. The Skerry light's range has doubled, from 9 nautical miles with the original whale-oil lamp to 18 with the electric lamp fitted in 1961.

Then 9, now 18: the change in range.

Why the other answers are wrong

B. The lamp was converted to paraffin in 1874.
A conversion, but no ranges.
C. The Skerry lighthouse was built in 1811.
A date, no range.
D. The lighthouse is still a working light.
Status, no range.

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