5. B　从文章最后可知，作者认为这是一项很有意义的活动。

　　Ⅲ.1. By noticing the machines were broken./ By noticing something was wrong with the machines.

　　2. Las Vegas earns much from gambling. / Las Vegas were growing from gambling.

　　3. The price of certain metals.

　　4. Various types/ways of gambling.

　　Ⅳ.One possible version：

　　As is shown in the pictures, trees play an important part in water and soil conservation. In the left picture, people are fleeing from sand dunes because they cut down all trees. In the right picture, people have planted many trees and the sand has retreated.

　　People should realize the important relation between human and nature. If we continue to destroy forests, destroy the balance of nature, the real victims will be us humans.

　　It's never too late to mend. After suffering from sand storms, people have now realized the importance of trees in water and soil conservation. They are planting more and more trees to fight against the greedy desert.

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