问题补充:
单选题AccordingtoanewsurveycarriedoutbyanAmericanuniversity,learning______secondlanguagecanresultin_______increaseinthepowertolearnyournativetongue.A.a; theB.不填; theC.a; anD.the; an
答案:
C解析“a second language”泛指一们第二外语; 后面的increase作名词讲, 是可数名词, 前面需加不定冠词an。