单项选择题In some speech community, two languages are used side by side with each having a different role to play, this is ______.
单项选择题Concerning the main characters, which statement is true
单项选择题Which of the following is NOT an element of the code of etiquette
单项选择题Why is the Fort Chimo scheme not very popular
单项选择题According to the writer which of the following is put of chivalry A knight should ______.