1. Single choice A. Article: (1) The distinction between a/an: Pay attention to the words starting with "u". If you read the letter u itself /ju:/, add one: ausefulbook, auniversity, Australian seat in front of it; If you pronounce other sounds, add an: anunsualchair, anunimportantmeeting (2) before the ball game and three meals, do not add (3) a-one, the-that (4) a "u", which is a difficult competition question; An "h"; An "s"; An "X" is pronounced in Chinese Pinyin. If there is an initial, use a, such as u-you; If there is no initials, use an, such as H-EIQI, S-AISI, X- Aikesic. Conjunction phenomenon: (2) Adjacent consistent conjunctions; (3) Connecting sentences in todo form.