quEstions 18 to 20 ArE BAsED on thE Following pAssAgE.At thE EnD oF thE pAssAgE, you will BE givEn 15 sEConDs to AnswEr thE quEstions.
now listEn to thE pAssAgE.
whiCh oF thE Following is truE、ACCorDing to thE pAssAgEA．timE rEvErts BACk to stAnDArD timE on thE First sunDAy oF oCtoBEr.
B．thE unitED stAtEs hAs usEDDAylight sAving timE sinCE 1918.
C．thE uniForm timEACt rEquirEsDAylight sAving timE BE oBsErvED By All stAtEs.
DAylight sAving timE wAs First usED inEuropEAn CountriEs At thE BEginning oF worlD wAr i.