Digital SAT Reading and Writing Practice Question #1661
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Punctuation symmetry: an appositive opened by an em dash must be closed by an em dash.
The nonrestrictive appositive phrase ('the chief seismologist at the Pacific Geophysical Observatory') begins with an em dash ('—'). Paired punctuation requires that it also close with an em dash ('—')....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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