题目内容：

    Construction on Knolly's Tunnel began in 1896， and it was opened on August 13th， 1898 by the man it was named after--Sir Clement C． Knolly， Acting Governor of Trinidad． It linked Rio Claro with Port of Spain． Its architecture is still admired and studied today， and many are amazed that Knolly's Tunnel has stood up to the earth's movement over so many years．

Much research is being done on the tunnel． At the top of Knolly's Tunnel are cottages covered with leaves， where visitors can sit and enjoy the beauty of nature． Standing at the beginning of Knolly's Tunnel， you can see nothing but the tiny light at the end． The train tracks have been removed and replaced with small stones． Visitors can drive through the tunnel or walk through， but should do so in groups for safety． In the old days， there were no lights， but now there are street lights on the way to the tunnel， though not inside．

On your way in， you may notice some manholes on the walls of the tunnel． These were there for individuals to step into for safety as the train passed． Knolly's Tunnel can be accessed through Tabaquite and through Mitchell Gap． The road was recently improved， but is better when you enter from Tabaquite， and there are signs on the road directing you to Knolly's Tunnel．

On the drive to Knolly's Tunnel there are two other cottages where visitors can sit and just enjoy nature． At the site itself， there is nothing to purchase to eat or drink， but in Tabaquite there are several bars， a restaurant， and food outlets． A gas station and a health centre are also close by．

For those who admire architecture， Knolly's Tunnel is a must-see when visiting Trinidad． For the nature lovers， there is no better place for them to be and for the historians， they can walk or drive through Knolly's Tunnel knowing that many of our ancestors toiled （worked hard） on its structure． So when you visit Trinidad， don't forget to take a look at Knolly's Tunnel!

1.Knolly's Tunnel is special in ______ ．

A. its environment B. its function

C. its location D. its architecture

2.The underlined word "site" in the paragraph 4 refers to ______ ．

A. Trinidad B. Tabaquite

C. Mitchell Gap D. Knolly's Tunnel

3.What is the purpose of the passage？ ______

A. To suggest a visit to Knolly's Tunnel．

B. To introduce the history of Knolly's Tunnel．

C. To evaluate the value of Knolly's Tunnel．

D. To witness the change of Knolly's Tunnel

4.The passage above is probably taken from ______ ．

A. a geography textbook B. a travel journal

C. a sports report D. a health and fitness magazine