BEForE thE 20th CEntury thE horsE proviDED DAy to DAy trAnsportAtion in thE unitED stAtEs. trAins wErE usED only For long-DistAnCE trAnsportAtion. toDAy thE CAr is thE most populAr{{u}} (67) {{/u}}oF trAnsportAtion in All oF thE unitED stAtEs. it hAs ComplEtEly{{u}} (68) {{/u}}thE horsE As A mEAns oF EvEryDAy trAnsportAtion.AmEriCAns usE thEir CAr For{{u}} (69) {{/u}}90 pErCEnt oF All pErsonAl{{u}} (70) {{/u}}. mostAmEriCAns ArE ABlE to{{u}} (71) {{/u}}CArs. thE AvErAgE priCE oF A{{u}} (72) {{/u}}mADE CAr wAs, 500 in 1950, 740 in 1960 AnD up{{u}} (73) {{/u}}750 in 1975.During this pErioDAmEriCAn CAr mAnuFACturErs sEt ABout{{u}} (74) {{/u}}thEir proDuCts AnD work EFFiCiEnCy. mEAnwhilE, thE yEArly inComE oF thE{{u}} (75) {{/u}}FAmily inCrEAsED From 1950 to 1975{{u}} (76) {{/u}}thAn thE priCE oF CArs. For this rEAson,{{u}} (77) {{/u}}A nEw CAr tAkEs A smAllEr{{u}} (78) {{/u}}oF A FAmily’s totAl EArnings toDAy. in 1951{{u}} (79) {{/u}}it took 8.1 months oF An AvErAgE FAmily’s{{u}} (80) {{/u}}to Buy A nEw CAr. in 1962, A nEw CAr{{u}} (81) {{/u}}8.3 oF A FAmily’s AnnuAl EArnings.By 1975 it only took 4.75{{u}} (82) {{/u}}inComE. in ADDition, thE 1975 CArs wErE tEChniCAlly{{u}} (83) {{/u}}to moDEls From prEvious yEArs. thE{{u}} (84) {{/u}}oF thE AutomoBilE ExtEnDs throughout thE EConomy{{u}} (85) {{/u}}thE CAr is so importAnt toAmEriCAns.AmEriCAns spEnD morE monEy{{u}} (86) {{/u}}thEir CArs running thAn on Any othEr itEm.

A．rAising
B．rEDuCing
C．mAking
D．improving