香港所需淡水资源绝大部分由大陆提供，主要原因是香港（　　）

I have two friends. They are Bob and his sister Amy. Look! Bob

has a white T-shirt. He is not tall but fat. He is 10 years old.He

can ride a bike. Amy is the girl. She has a red skirt. She likes red

very much. She can fly a kite. She is 9 years old.

Oh! Look! The boy is me. I have a big mouth and long hair. I am

10 years old. I like swimming. I can swim very well. The little dog

is my friend, too. He can run and jump. He has big ears and a big

mouth. He is cute (可爱). I love him.

我国“十一五”计划已基本完成，在此期间，我国的四大工程﹣﹣西气东输、西电东送、南水北调、青藏铁路取得了举世瞩目的成就．对于南水北调工程，叙述正确的是（　　）