【文章大意】本文是说明文,介绍了火山喷发给人类带来的经济利益。

　　1.C　词义推测题。本句中but后的内容介绍了火山灰和熔岩风化之后形成了肥沃的土壤,可见but之前描述的是火山灰和熔岩的害处,应选择含贬义色彩的词汇,C项符合文意。detrimental意为“不利的,有害的”。

　　2.D　推理判断题。A项内容在第一段提到;B项在第二、三段提到;C项在第四段提到;D项文中未提及,故选择D项。

　　3.B　推理判断题。第五段中的例子是为了说明,火山爆发产生的巨大威力瞬时保护了古代的文明,故选B项。

　　4.A　标题归纳题。文章介绍了火山给人类带来的经济利益。A项符合文意。

　　二、语法填空(共10小题;每小题1.5分,满分15分)

　　A couple had been married for over 60 years.They shared everything,talked about everything and kept no secrets 1. each other except that the woman had a box in a drawer 2. she had cautioned her husband never to open or ask her about. 

　　He’d never thought about it ever since.One day 3. woman got very sick and the doctor said she wouldn’t recover.To sort out their affairs,the husband took down the box and 4.(bring) it to his wife’s bedside.She agreed it was time that he should know 5. was in the box. 

　　6.(open) it,he found two small table mats and a sum of money totaling $ 25,000.He asked her about the contents.“When we were to be married,” she said,“my grandma told me the secret of happy 7.(marry) was never to argue,and I should just keep quiet and make a mat 8. I got angry with you.” 

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