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题库 / Prep2007E2-SC-146
The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's.
extinction; its numbers are now five times greater than
extinction; its numbers are now five times more than
extinction, their numbers now fivefold what they were
extinction, now with fivefold the numbers they had
extinction, now with numbers five times greater than
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We don't need a “those” here. 'when the use of ddt was...' is, or at least can be interpreted as, an adverb phrase (not an adjective phrase).
if the descriptive phrase placed there were an adjective phrase (or were being interpreted as one, at least), you'd want 'those' to assure a parallel construction.
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