The weather conditions had improved from Saturday，but dozens of military divers quickly withdrew(撤退)due to rapid sea currents.Divers also unsuccessfully tried to get to the wreckage on Saturday.

　　As hopes faded for the missing crew，about 80 family members aboard a navy patrol boat sailed around the site and watched rescue operations.

　　“My Son！My Son！”One woman shouted while boarding the ship late Saturday at a naval base south of Seoul for the overnight journey to the accident area as other relatives cried in grief.The family members were to return later Sunday to a naval base south of Seoul，where other relatives awaited news.

　　6．The ship that sank on Friday________.

　　A．caused the worst naval disaster in South Korea

　　B．must have been caused by explosion

　　C．crossed the border of North Korea

　　D．will take weeks to leave the water

　　解析　细节理解题。根据文章第六段“The explosion tore open the rear hull of the Cheonan，shut down its engine，wiped out power and caused the ship to sink a little over three hours later.”可知这次事故是由于爆炸引起的。

　　答案　B

　　7．The ship sinking in 1974 was caused by________.

　　A．carelessness

　　B．natural disaster

　　C．flood

　　D．earthquake

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