D．Some parts of it are being destroyed.

　　解析：选D　细节理解题。根据第一段"Believe it or not, the Great Wall is being destroyed by people."故选D。

　　2．The underlined part "those sections far away from the public eyes" (in Para.2) refers to the parts of the Great Wall ________.

　　A．nobody can watch

　　B．that are too far to be seen

　　C．that are too difficult to find

　　D．that are not well­known to the public

　　解析：选D　细节理解题。根据画线部分前的"People are familiar with ...open to tourists for many years."可以推出这部分长城没有向游人开放，故选D。

　　3．What's the main reason of the Great Wall being destroyed?

　　A．The local people sell the bricks for a living.

　　B．The local people are short of culture knowledge.

　　C．The local people think that the Great Wall is not important.

　　D．The local people need bricks and stones to build houses.

　　解析：选B　细节理解题。根据第三段的"The lack of knowledge is ...reasons behind human."故选B。

　　4．Which of the following may be the best title for this passage?

　　A．How to Protect the Great Wall

　　B．How the Great Wall came into being

　　C．The Great Wall Being Rebuilt

　　D．The Great Wall Being in Danger

　　解析：选D　标题归纳题。根据通篇文章和文章的开头可以看出应选D。

　　B

　　The basic flag of the United States is one of the world's oldest national flags. Only the basic flags of Austria, Denmark, Great Britain, the Netherlands, Sweden, and Switzer land are older.

　　During the discovery and settlement of what is now the United States, the flags of various European nations were flown over the land, as symbols of possession.

　　Later, in the Colonial and Revolutionary War periods, flags representing famous persons, places, and events were flown in the American Colonise.

The first official flag of the United States was created by Congress on June 14,1777. It