why wAs kohoutEk rEFErrED to As" thE ComEt oF thE CEntury"
A．it wAs thought to BE ExtrEmEly olD.
B．it pAssEs thE EArth onCE A CEntury.
C．sCiEntists prEDiCtED it woulD BE vEry Bright.
D．sCiEntists hAvE BEEn trACking it For A CEntury.