单项选择题Yellow Stone National Park is located in
单项选择题A(n) ______ is a phonetic unit or segment.
单项选择题The word smog comes from smoke+fog . This is an example of ______ in morphology.
单项选择题It was ______ who brought Christianity to Britain.
单项选择题The subject area of ______ is on the borders of linguistics and literature.