阅读理解。 Flags have existed for over 3000

题目：

阅读理解。

     Flags have existed for over 3000 years. The earliest flags were wooden or metal poles topped with a

carving (雕刻品). About 2000 years ago pieces of fabric were added to some poles for decoration. Over the next 500 years the free-flying part of the flag became more important.

     Every country today has its own flag. Many groups and organizations also have a flag which stands for, or symbolizes, the aims of the group.

     The UN flag depicts (描绘) a world map, centered on the north pole. The map is surrounded by an

olive (橄榄)wreath (花环)symbolizing peace and co-operation. The flag is blue and white.

1. Flags have been in existence for _____  . 

A.500 years

B. more than 3000 years

C. about 2000 years

D. between 500 and 2000 years

2. A very old flag is likely to _____.

A. be made of fabric

B. have a map on it

C. have white shapes on it

D. be made of carved wood

3. An olive wreath is used to represent _____ .

A. peace

B. purity    

C. justice

D. equality