______ is a system of arbitrary vocal symbols used for human communication.

单项选择题Which of the following sports was NOT invented in Britain

单项选择题Who is the creator and a great master of the historical novel

单项选择题The writer thinks that the growth of specialist societies and periodicals had helped scholars to ______.

单项选择题The writer claims that it is important for specialists to be able to travel because ______.

单项选择题In the writer's opinion, interdisciplinary studies are important because they ______.