题目

--Tom and Jim study very hard． --____________ and ________________． A．So do they；so you do    B．So they do；so do you C．They do so；you do so    D．So do they；so do you 答案：BIn communication, a smile is usually ______ strong sign of ______ friendly and open attitude. A．the; /B．a; anC．a; aD．the; an