Susan wanted to be independent of her parents．She tried _________ alone．but she didn’t like it and moved back home．

A．living

B．to live

C．to be living

D．having lived

多动综合征在学龄前期的临床表现有（）

A.注意集中短暂

B.游戏能力落后

C.好发脾气

D.行为冲动，情绪易波动

E.常伴有遗尿