简介： 第一节、单项选择（12分） （ ）21. In the word "down", the underlined part is pronounced as______. A. /a?/ B. /??/ C. /a?/ D. /a: / （ ）22. I think English is ______ useful language, and it’s also ______ important language. A. an, a B. a, an C. an, the D. a, the （ ）23.I...