Directions: Fill in the blank with the most appropriate word(s).
The fibre optic cables that carry telephone calls cross country are so _______ that a piece of 100 miles thick wire is clearer than a standard window pane.
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transparent
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fragile
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immaculate
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iridescent
A
Correct answer
Explanation
Transparent means allowing light to pass through so objects behind can be clearly seen - exactly what's being described. The comparison to a clear window pane makes it clear that transparency is the key quality. Fragile means breakable, immaculate means perfectly clean, and iridescent means showing rainbow colors.