【Ya-Ting Chang】評論
Around the ninthcentury the population of the Mayans dropped. (大約第九世紀，瑪雅人的人口下降。)No one knowswhether there was a problem of a change in the climate, war with other groups,or the wearing out of the soil. (沒有人知道是否有一個在氣候變化問題、與其他團體戰爭，或者土壤的疲乏。)45 The reason theMayan culture dropped in population is still unknown.(瑪雅文化的人口下降的原因仍是未知數。)
【張佳興】評論
這題麻煩解釋一下
【Chun-Ju Lin】評論
文章中只說Around the ninth century the population of the Mayans dropped.後面沒有接說why，所以選A