At the beginning of the 20th century, many people thought that the family was falling apart—__________, they thought it was dying． （ ）
A：on the other hand
B：for another
C：in other words
D：in addition
已知x没有平方根，且|x|=64，则x的立方根为（ ）
已知正数a，b，c满足a2+b2+c2=6．
（Ⅰ）求a+2b+c的最大值M；
（Ⅱ）在（Ⅰ）的条件下，若不等式|x+1|+|x+m|≥M恒成立，求实数m的取值范围．
