A well-written speech a lot, such as a good choice of words, a clear
structure, a distinct theme, etc.
A. calls on
B. calls for
C. calls up
D. calls off
网友回答
A. calls on
(答案→)B. calls for
C. calls up
D. calls off
解析：句意，一篇写得很好的发言稿要求很多，例如词汇的准确选择，清晰的结构以及明显的主题。calls on拜访calls for要求calls up给……打电话calls off取消，根据题意，故选B。