听力原文:Today, most countries in the world have canals. Goods can be moved cheaply by boa
In places where it does not rain very often, irrigation canals carry water from rivers or lakes, such as the lake behind .the Aswan Dam on the Nile River, and provide the irrigation water.
In places where there is too much water, canals can drain the water off the land for use in farming. In Holland, acres and acres of land have been drained in this way. Since much of this drained land is below sea level, the water in the canals has to be pumped up to sea level. Dikes have been built in Holland to keep the sea from coveting the land.
Which of following is the best title of the text?
A.How Aswan Dam was buik.
B.Transporting with canal boats.
C.Canals and their uses.