单选题：Whatwillhappenifwhalenumbersdroptoacertaindegree?

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题目内容：

Whatwillhappenifwhalenumbersdroptoacertaindegree? A．Thenumberwillbouncebackatacertainpoint.
B．Whalesbegintoadapttonewlivingconditions.
C．Theextinctionofwhalesbecomesunavoidable.
D．Abiologicaldisasterwillcometotheearth.

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