Your hair needs（）You'd better have it cut tomorrow.

A．listen attentively during the lecture
B．evaluate what the speaker is saying as you listen
C．take it easy if you can't understand the lecturer at first
D．bring a dictionary with you in case you can't understand

A．you become interested in the fly buzzing on the windowpane
B．you pay your undivided attention on lectures
C．you are distracted by a peculiar habit of the lecturer's
D．you let your mind wander