单项选择题
A．The course is open to all next semester. B．The notice may not be reliable. C．The woman has not told the truth. D．He will drop his course in marketing.
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.