According to a new survey carried out by an American university, learning second language can result in increase in the power to learn your native tongue.
A. a; the
B. 不填; the
C. a; an
D. the; an
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A. a; the
B. 不填; the
(答案→)C. a; an
D. the; an
解析：考查冠词：第一空填a，a second language”泛指一门第二外语; 后面的increase 作名词讲, 是可数名词, 前面需加不定冠词an。句意：根据一个美国大学最近的调查，学习一门外语可以导致学习本族语能力的增加。选C。