閱讀理解。
   The Plain of Jars（石缸平原）is a great manmade wonder（奇觀）in Laos，a country in Southeast Asia.It is made up of thousands of stone jars.More than 90 jar sites have been found there.Each site has from 1 to 400 stone jars.The jars come in different sizes from 1 to 3 meters tall.Scientists have long been perplexed by their original（最初的）use.
   Not long ago，scientists found ancient things and burial practices at the Plain of Jars."This will be the first major effort since the 1930s to try to understand the purpose of the jars and who created them，"Dougald O'Reilly from the Australian National University said."The jars are empty now，but it is possible that they were once used to hold bodies."
   Only a few simple objects，such as a handful of glass beads（玻璃珠），have been found at the burial sites.And scientists think they are from about 500 or 600 BC to 550 AD.
   An Australia-Laos research team spent a month collecting data（資料）at the site.O'Reilly said，"Though the stone jars remain a mystery，I hope a better understanding of the Plain of Jars will help have it listed as a World Heritage site（世界遺產(chǎn)保護區(qū)）．"
（1）The Plain of Jars is in

A

A

．
A．Asia
B．Europe
C．America
D．Australia
（2）What do we know about the jars？

C

C

A．They are of the same size.
B．They were used for holding water.
C．They are all made of stones.
D．All the sites have the same number of jars.
（3）The underlined word "perplexed "means "

B

B

" in Chinese.
A．無視
B．困惑
C．遺忘
D．玩弄
（4）What can we learn from the passage？

C

C

A．The Plain of Jars is a natural wonder.
B．There are all kinds of things in the jars.
C．The mystery of the Plain of Jars hasn't been solved.
D．The Plain of Jars is a World Heritage site.
（5）Where can we probably find the passage？

D

D

A．In a storybook.
B．In a movie review.
C．In a dictionary.
D．In a geography magazine.