ABSTRACT
The teaching content, teaching time, progress, assessment content and assessment methods of each experimental class were the same. The only difference was the teaching method. For Class A and D, teachers just used one language, that is Chinese and Korean, respectively, but for Class B and C, teachers adopted the method of bilingual teaching through the contrast of Chinese and Korean. But they had a slight emphasis on the teaching language. For example, the teacher of Class B mainly wrote Chinese on the blackboard while the teacher of Class C wrote Korean.
