题目

如图，在⊙O中，直径AB⊥弦CD于E，连接BD，若∠D=30°，BD=2，则AE的长为A．2        B．3  C．4        D．5    答案：B解析:略  ―Do you think you can get there on time?―Yes,      the car doesn’t break down.A.if only  B.even if     C.in case     D.so long as