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Thephrase“cancerposse”(Line4,Para.3)probablyrefersto_____.
A.acancerresearchorganization
B.agroupofpeoplewhosufferfromcancer
C.peoplewhohaverecoveredfromcancer
D.peoplewhocopewithcancer
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Whichofthefollowinggroupsismorevulnerabletocancer?
A.hildren
B.Peopleintheir20sand30s
C.Youngadults
D.lderlypeople
（I）求参数的矩估计量；
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AllofthefollowingstatementsaretrueEXCEPT_____.
A.Krisarrisafemalewriter
B.Krisarrismorethan31-year-old
C.Krisarrworksinacancercenter
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（I）求；