.Sara had  _________ the disadvantages of her background and became a successful lawyer at last .

A．recognized

B．struggled

C．prevented

D．overcome

吹风机使用时不启动，主要原因有（）和开关断路等。

A.电源线断路

B.吹风机受潮

C.吹风机过热

D.电源线潮湿