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According to a new study by a British’s university , learning ______ second language can lead to ________ increase in your brain power.  
A．a ; theB．不填；theC．a ；anD．the ；an
C
考查冠詞用法。不定冠詞與序數詞連用，表示另一，再一，第二空是特指大腦能力的增加，所以用the，句意：根據英國一所大學的新研究，學習另一門語言會導致大腦能力的增加。所以選C。
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