5. 【解析】选C。句意: 这次活动的目的是提高公众对被动吸烟危害的认识。raise one’s awareness of sth. 提高某人对某事的认识。existence存在; connection联系, 关系; consciousness知觉, 觉悟, 感觉。

　　Ⅱ. 1. erupted

　　2. destroyed/ruined

　　3. wealthy

　　4. commercial

　　5. Gradually

　　6. volcanoes

　　7. document

　　8. exploded

　　9. educated

　　10. poisonous

　　Ⅲ. 1. is not aware of

　　2. in memory of

　　3. could have finished

　　4. was said to have studied

　　5. their son being admitted to

　　Ⅳ. 【参考范文】

　　People from ancient civilization founded many famous buildings. Unfortunately, some of them gradually fall in ruins, while some remain today. In memory of these lost civilizations, some of them have been rebuilt or repaired according to the documents. Because of natural disasters like sandstorms, the remaining buildings are greatly destroyed. Many researchers and scholars are looking for solutions to protecting these cultural remains. There is no doubt that more and more people are aware that the cultural relics are of great significance and join in protecting them.

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