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23.因为AB//CD,角ABC=60度,据两直线平行同位角相等,所以角ECB=120度,又因为MC平分角ECB,所以角ECM=角MCB=60.因为角MCN=90度,所以角BCN=30,角DCN=180-角ECB-角BCN=30

回哪答哪, 回哪答哪1.Lily never stops talking .改为反义疑问句Lily never stops talking,()()?2.It's bad weather today.改为感叹句()()weather it is today.3.Li Lei speaks English very well 变为感叹句()()Li Lei speaks English!4.There is much rain