简答题As a chairperson, he/she is supposed to take several roles. What are they? A、organizer B、journalist C、spokesperson D、manager E、communicator F、waiter/ waitress G、action person H、connector简答题We can make additional comments about some point of the text in the bibliography.简答题Compared with presentation, audience in a seminar would be much more active.简答题To get ready for the Q&A session as a speaker, we should (1)and (2).简答题Fill in the blank with the appropriate signal word in the box. Among all the theories about infection, ____________ I want to talk about is through human remains. A、the first thing B、furthermore C、in conclusion D、while