分解因式2x2-2y2=______
人类生活需要能量。下列能量主要由化学变化产生的是()
-WheredidyougolastSunday?
-Wewenttothebeach,andwehadgreatfun_______volleyball.
-Theyoungmanwhoenteredourfactorylastmonthhasmadesomemistakesthisweek.
-Well._______.
Throughout_______history,Englishlanguagehasgonethroughmanychanges.
