题目

 Right, we keep in touch by writing to each other. A. normally     B. absolutely            C. actually            D. regularly 答案： 【解析】选D。考查副词辨析。句意: 是的, 我们通过定期写信保持联系。normally正常地; absolutely绝对地; actually实际上; regularly定期地。根据句意, 选用regularly。设命题p：a，b，c是三个非零向量；命题q∶{a，b，c}为空间的一个基底，则命题p是命题q的A.充分不必要B.必要不充分C.充要条件D.既不充分也不必要