单项选择题
A．They have known each other since their schooldays. B．They were both chairpersons of the Students’ Union. C．They have been in close touch by email. D．They are going to hold a reunion party.
A．Newly-launched products. B．Consumer preferences. C．Survey results. D．Survey methods.
A．Applause encourages the singer. B．She regrets paying for the concert. C．Almost everyone loves pop music. D．The concert is very impressive.