If you ________ your attention on the job in hand, you’ll soon finish it.

A．adapt

B．concentrate

C．apply

D．request

荆芥的功效是( )

A．消疮止泻，透疹止血

B．发表止痉，消疮止泻

C．发表止痛，利水消肿

D．祛风解表，透疹消疮，止血止痉

E．发表通窍，胜湿止痛，止血