The opportunity to explore and play and the encouragement to do so Can ________the performance of many children ．
A、withholdC
暂无解析
Successfullearningisnota(n)________activitybutconsistsoffourdistinctstagesinaspecificorder
TheinteractionsbetweenChinaandtheUSwillsurelyhaveasignificant_______on.peaceandstabilityintheAsia.—Pacificregionandtheworldasawhole.
Tomplacedthebanknotes，_________thechangeandreceipts，backinthedrawer．
设数列 {an} 的前 n 项和为 Sn，则 {an} 等差。
(1) S n4=n 2+2n, n=1,2,3
(2) S n4=n 2+ 2n +1,n=1,2,3
In1991，whilet11eeconomiesofindustrializedcountriesmetaneconomic_____，theeconomiesofdevelopingcountriesweregrowingveryfast．
