百家讲坛的阎崇年研究哪一位历史人物而出名？（）
A.利玛窦
B.毛文龙
C.袁崇焕
D.徐光启
参考答案：C
The Audiolingual Method develops the separation of the language ______ into a pedagogical device, that is, listening, speaking, reading and writing.
风力机检修中怎样更换接触器？
