Tourism is the ______ for the country’s economy, so its government tries its best to ______ both the natural scenery and the places of interest.
A.center; protect
B.heart; reserve
C.focus; keep
D.engine; preserve
网友回答
D解析句意是：旅游业可以拉动该国的经济，所以政府尽力保护自然风光和名胜。Engine是发动机。选D。