Question

Which sentence has an elliptical adverb clause with an understood word or words?

As we travel higher than does the sea level, the boiling point of water drops.
Water turns into ice when the temperature is lowered to 32°F.
Methyl alcohol boils at a lower temperature than water.

Answer 1

As we travel higher than does the sea level, the boiling point of water drops.

Step-by-step explanation:

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Answer 2

The sentence that has an elliptical adverb clause with an understood word or words is the first one - As we travel higher than does the sea level, the boiling point of water drops.
Instead of saying - as we travel higher that the sea level travels, you can omit the verb.