题目

Education has always been a hot topic among parents ______ it is directly related to the future of their children. A . as B . in case C . unless D . even though 答案：A已知sinθcosθ＞0，则θ所在象限是（　　）A．第一或第二象限B．第二或第三象限C．第二或第四象限D．第一或第三象限