Question

read the paragraph. then, add the best topic sentence.
__________ the uros first built islands on lake titicaca in peru and bolivia many years ago to escape their enemies on land. they began constructing the islands out of blocks of mud covered with thick layers of hollow reeds. the reeds made these islands light enough to float. on these islands, the uros have made houses, shops, and boats out of reeds. today there are still over one hundred islands floating on the lake, and up to ten families live on each island.
the uros people of peru and bolivia once had many enemies.
the uros people of peru and bolivia build floating islands to live on.
today, the uros people of peru and bolivia use some modern technology.
floating islands are found in many bodies of water.

Explanation:

This topic sentence needs to summarize the entire paragraph, which focuses on the Uros people's creation and use of floating reed islands on Lake Titicaca, including their origin, construction, and current use. The first option only focuses on enemies, which is a minor detail. The third option mentions modern technology, which is not discussed in the paragraph. The fourth option is too broad, as the paragraph is specifically about the Uros' islands. The second option covers the core subject (Uros people) and their key practice (building floating islands to live on) that the whole paragraph elaborates on.

Answer:

The Uros people of Peru and Bolivia build floating islands to live on.