— We are getting married! — ______________ A. Congratulations! B. You are really happy! C. Oh, really? D. Congratulate! 答案:A表示“祝贺…!”要用congratulation的复数形式: “Congratulations!”, 不可用动词congratulate 已知方程,则下列说中,正确的是( )A. 方程两根之和是1 B. 方程两根之和是1C. 方程两根之积是2 D. 方程两根之差是1