---A car knocked Jack down while he was playing on his way home.

---Really? We are told   in the street.

A．not playing

B．not play

C．don’t play

D．not to play

既能祛风通络，又能杀虫止痒的药物是( )

A．防己
B．桑枝
C．海桐皮
D．五加皮
E．豨莶草