pAssAgE 10 in thE lAtE 1960’s, mAny pEoplE in northAmEriCA turnED thEir AttEntion to EnvironmEntAl proBlEms, AnD nEw stEEl-AnD-glAss skysCrApErs wErE wiDEly CritiCizED、ECologists pointing {{u}} (1) {{/u}} thAt A ClustEr oF tAll BuilDings in A City oFtEn ovErBurDEns puBliC trAnsportAtion AnD pArking lot {{u}} (2) {{/u}} skysCrApErs ArE Also Enormous {{u}} (3) {{/u}}, AnD wAstErs, oF ElECtriC powEr. in onE rECEnt yEAr, thE ADDition {{u}} (4) {{/u}} 17 million squArE FEEt oF skysCrApEr oFFiCE spACE in nEw yorkCity rAisED thE {{u}} (5) {{/u}} DAily DEmAnD For ElECtriCity By 120,000 kilowAtts--Enough to {{u}} (6) {{/u}} thE EntirE City oFAlBAny For A DAy. glAss-wAllED skysCrApEr CAn BE EspECiAlly {{u}} (7) {{/u}}. thE hEAt still, pEoplE {{u}} (19) {{/u}} to BuilD skysCrApErs For All thE rEAsons thAt thEy hAvE AlwAys Built thEm--pErsonAl AmBition AnD thE 20 oF ownErs to hAvE thE lArgEst possiBlE Amount oF rEntABlE spACE.

A．powEr
B、CApACitiEs
C．potEntiAls
D．CApABilitiEs