According to a new study by a British’s university learning second language can lead to

问题补充：

According to a new study by a British’s university , learning second language can lead to increase in your brain power.

A. a ; the

B. 不填；the

C. a ；an

D. the ；an

答案：

A. a ; the

B. 不填；the

(答案→)C. a ；an

D. the ；an

解析：考查冠词用法。不定冠词与序数词连用，表示另一，再一，第二空是特指大脑能力的增加，所以用the，句意：根据英国一所大学的新研究，学习另一门语言会导致大脑能力的增加。所以选C。