现在解决东部地区的能源问题，又有利于环境保护的工程是（　　）

A．南水北调

B．东电西送

C．北煤南运

D．西气东输

The balloons, a great ______, ______ the atmosphere of the festival.

A．scene; added up

B．scenery; added up to

C．view; added

D．sight; added to