4단원http://midwstr.ebs.co.kr:80/ebsvod/mid/2017/10030249/m10/20171218_144010_m.mp4http://wstr.ebs.co.kr:80/ebsvod/mid4/2018/07.te/term1/grade1/final/soc/1m/temp01so0ft180m001h.mp4
3단원http://midwstr.ebs.co.kr/ebsvod/mid/2017/10030249/m10/20171215_114610_m.mp4http://wstr.ebs.co.kr:80/ebsvod/mid4//2018/07.te/term1/grade1/mid/soc/1m/temp01so0mt180m003h.mp4http://wstr.ebs.co.kr:80/ebsvod/mid4//2018/07.te/term1/grade1/mid/soc/1m/temp01so0mt180m004h.mp4
