小题1:B
小题2:C
小题3:A
小题4:D
小题1:细节理解题，由文中语句“Scientists are working on using that energy to make electricity. The United States and a few other countries have started doing research on wave energy, and it is already being used in Scotland.”可知。
小题2:理解归纳题，由文中语句“The winds start out by making little ripples (波纹) in the water, but if they keep on blowing, those ripples get bigger and bigger and turn into wave s”可知。
小题3:细节理解题，由文中语句“Oceans cover three quarters of the earth’s surface. That would make wave power seem perfect for creating energy around the world.”可知。
小题4:标题归纳题，纵观全文理解可知。