摘要： Nowhere in nature is aluminum found free ,owing to its always with other elements , most commonly with oxygen . A. combined B. having combined C. combine D. being combined Keys: 1----5:CDACA 6---10:CDDDC 11---15:DDDCB 16---20:CCBBC 21---25:ACACC 26---30:BACDB 31---35:CDACA 36---40:CBBAA 41---45:BBBAC 46----50:BABCD 51---55:ACACB 56---60: AACDC 61---65: ADCBB 66---70: BCACA 71---75: BBDBA 76---80: ABCAD 81---85: DCDAC 86---90: DAADC 91---95: BDBDA 96---100: BABCC 101---105: CACBC 106---110: CCACB 111---115:ACDDB 116---120: ACBCA 121---125: DBDAD 126---130: ADBBB 131---135: AACDB 136---140: BDBCB 141---145: BAAAC 146---150: BBDCC 151---155: DBACB 156---160: CDCDC 161---165: DACAB 166---170: DBDDB 171---175: ABDCC 176---180: ABCCB 181---185: CAABA 186---190: DADBC 191---195: CBBBB 196---200: BCADD 201---205: CCABC 206---210: CCBBB 211---215: ACCCD 216---220: CDCDC 221---225: AACAD 226---230: BABAB 231---235: BCDCA 236---240: DCBBC 241---245: CDCCB 246---250: DCCDA

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