In 2011, artist Grimanesa Amorós stepped off a boat made of totora reeds (芦苇) onto an island—also made of totora reeds — in the northwest portion of Lake Titicaca. It’s home to one of the world’s most innovative achievement of human engineering: the Uros Islands.

The man-made floating islands, which are home to the native Uros people, are created by putting layers upon layers of totora roots and reeds. This water-resistant plant grows in the lake and is the lifeblood of the Uros community. It is used to make boats, houses, roofs, mattresses (床垫) and more. The plant is also eaten and serves as medicine, and its flowers are used to make tea.

However, the Uros weren’t always dependent on the totora. More than 500 years ago, the growing Inca Empire began to invade the Uros’ mainland villages. To beat this threat, the Uros began to build the islands, which could be launched deep into Lake Titicaca, away from danger. Hundreds of years later, there are now about 120 of these constructed islands, with around 1,300 people living on them.

To build the islands, the Uros first gather large blocks of totora roots. Multiple blocks are pulled together, and the roots and reeds mix naturally to form a layer about 1 to 2m thick. The totora reed is laid on top of this floating base. The Uros use a long tool to reach deep down into the water and cut the plant above the base. Then, the reeds are dried in the sun for one to four weeks and bundled (捆绑) together using a rope. Once dried, totora reeds are placed in alternating directions on top of the root blocks and become the ground that the Uros walk and build their homes on.

Today, urban influences are evident on the islands: Solar panels power bedroom lights and small TVs; a radio station operates on the main island. It’s evident that these modern changes and tourism have changed the Uros’ life on the lake. One thing remains certain, though. As long as there is totora growing at Lake Titicaca, the islands’ rooted foundation will stay the same.

【小题1】Which word can best describe the role totora reeds play in the Uro’s life?

A．Essential.

B．Symbolic.

C．Protective.

D．Sustainable.

【小题2】What was the original purpose of building the floating island?

A．To develop tourism.	B．To maintain their lifestyle.
C．To escape from enemies’ attack.	D．To be separated from the world.

【小题3】What does the fourth paragraph mainly focus on?

A．The key to selecting building materials.	B．The procedure of building the islands.
C．The difficulty of living on the island.	D．The method of spotting reeds.

【小题4】What might be the best title for the text?

A．Fancy Lifestyles of the Uros	B．Innovative Building Materials
C．Floating Homes on Lake Titicaca	D．A Must-see Tourist Attraction of Lake Titicaca