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：冠词考查题。序数词前用不定冠词表示“又一，再一”，用定冠词表示次序；泛指时用不定冠词。“根据英国大学的一项新的研究表明再学一门外语可以提高大脑的思维能力”。答案为C