题目

已知集合A={x|x2-2x-3≤0},B={x|x2+px+q＜0},若A∩B={x|-1≤x＜2},则p、q满足……(    ) A.2p+q+4=0                             B.p+q+5=0C.p+q=0                                   D.p-q=0 答案：A解析：A={x|-1≤x≤3},又A∩B={x|-1≤x＜2},可知方程x2+px+q=0必有一根为2.交际题 小Tom对圣诞老人说：“________”圣诞老人回答：“I'm OK, thanks.” [　　] A．How do you do?B．How are you? C．Are you OK?D．Are you fine?