Beneath the sunlit surface of the Black Sea lies a highly unusual marine environment. Below a depth of approximately 150 meters, the water contains virtually no dissolved oxygen. The Black Sea's anoxic zone _______ prevents organic materials from decomposing rapidly. Consequently, wooden shipwrecks dating back to the Byzantine Empire remain remarkably intact, offering archaeologists an unprecedented window into ancient maritime history.
Which choice completes the text so that it conforms to the conventions of Standard English?
- —an environment containing virtually no dissolved oxygen—Cevap
- B—an environment containing virtually no dissolved oxygen
- C, an environment containing virtually no dissolved oxygen—
- Dan environment containing virtually no dissolved oxygen,
Cevap
The phrase enclosed in matching em dashes: '—an environment containing virtually no dissolved oxygen—'
The sentence contains a nonessential appositive phrase ('an environment containing virtually no dissolved oxygen') that renames and describes 'anoxic zone.' To conform to Standard English conventions, this nonessential element must be set off from the rest of the clause using matching punctuation marks on both sides. The correct choice correctly uses a pair of em dashes to isolate the appositive phrase.
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Anahtar Kavram
Punctuation of Nonessential Elements
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