listEning 2 "EnvironmEntAl sCiEnCEClAss"
{$mEDiAurl}

whAt is thE proFEssor’s opinion ABout thE FuturE oF winD powEr
A、hE thinks thAt winD powEr will rEquirE morE rEsEArCh BEForE it BEComEs prACtiCAl.
B、hE supports thE usE oF winD powEr only As A sEConDAry sourCE oF EnErgy.
C、hE FEEls thAt most oF thE worlD’s EnErgy proBlEms will BE solvED By winD powEr.
D、hE BEliEvEs thAt thErE ArE too mAny proBlEms AssoCiAtED with winD powEr.