题目

Don’t mention that at the beginning of the story, or it may ____ the shocking ending.    A. give away      B. give out      C. give up        D. give off 答案：A 解析: 本句句意为：不要在故事的开头提及它，否则，那会泄露事故结尾。give away :泄露。故选A。1．已知集合A={x|ax-1=0}，B={x|x2-x-2=0}，且A∪B=B，求a的值．