Inanaturaldisaster-ahurricane，flood，volcaniceruption，orothercatastrophes-minutesandevensecondsofwarningcanmakethedifferencebetweenlifeanddeath．Becauseofthis，scientistsareworkingtousethelatesttechnologicaladvanc

　　67．B．细节理解题．根据第一段：In a natural disaster-a hurricane，flood，volcanic eruption，or other catastrophes-minutes and even seconds of warning can make the difference between life and death可知灾难预测的目的是为了挽救人民的生命财产；故选B． 　　68．D．推理判断题．根据第三段：when a powerful Gulf Coast hurricane made an unexpected direct hit on Galveston，Texas，killing at least 6，000people可知加尔维斯敦，德克萨斯遭受了最严重的破坏；故选D． 　　69．A．细节理解题．根据倒数第二段：After Georges missed New Orleans，some residents questioned the value of the hurricane forecasts in the face of such high costs可知新奥尔良的城市居民不满意是因为他们的制剂是徒劳的；故选A． 　　70．D．主旨大意题．通读全文，可知文章主要讲灾害预测的重要性和不确定性，它是为了挽救人民的生命财产，但目前技术还有限；故选D．