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Ababymightshowfearofanunfamiliaradult,_______heislikelytosmileandreachouttoanotherinfant.
WhenIcamethroughthecustomsattheairport,Ihadtopay________onaclockIhadbought.
Iboughtthiseighteenthcenturywritingdeskataquite________price.
Insomeschoolschildrenwhoprefertoreadbooksratherthan________footballbecomesocialoutcasts(被拋棄者).
設f(x,y)具有一階偏導數，且對任意的(x,y)，
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