What is the main purpose of the first paragraph?

(单选题)Sometimes, two varieties of a language exist side by side th (单选题)Classification of English speech sounds in terms of manner o (单选题)Captain, My Captain is written for ______. (单选题)______ are not a minimal pair in English. (单选题)The only black woman writer awarded Nobel Prize of Literatur (单选题)“God helps those who help themselves” is a citation from the (单选题)The most important and largest river in the United States of (单选题)Named in honor of the school’s founder, the Richard Brownsto (单选题)Using computer labs to supplement classroom instruction is m (单选题)Human relations seem stubbornly set. Wars have not been abol