첨삭 부탁 드립니다 ~ 통합 형 라이팅 게시판 : : 고우 해 커스 
 첨삭 부탁 드립니다 ~ 통합 형 
 토플러 | 조회 36 | 추천 0 
 The reading passage contends that forts built with stones that are vitrified . On the other hand , the lecturer brings up several points that contradict this argument . 
 First of all , the lecturer questions the validity of the point in the reading passage that it is possible that vitrification was caused by signal fires . This is attributed to the fact that signal fires were lit in one or two places on the walls and these spots were not changed over time . Thus , the reading passage ’ s first point is contradicted . 
 Moreover , the lecturer casts doubt on the point made by the reading passage that lighting is another plausible explanation for how the stones at these sites were vitrified . This is because structure is too large to cover whole walls with lighting . Consequently , the reading passage ’ s second point is invalid . 
 Last but not least , the lecturer disagree with the point mode in the reading passage that forts were built using volcanic rock . It is obvious that there is no evidence of past volcanic activity near any of these sites . Also , people from this period used local material for construction . As a result , with such reasoning , the reading passage ’ s final point is refuted . 
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