正n边形内角为，则n的值为（   ）

(单选题)有实根，且，则 (单选题)从长度分别为2、3、4、6的四条线段中任选三条作边，能构成三角形的概率为（ ）。 (单选题)式子在实数范围内有意义，则的取值范围为（ ）。 (单选题)Which is true according to the ads? (单选题)Mr. Green is planning to have a half year holiday in Califor (单选题)Salina’s grandparents are visiting Salina for three days nex (单选题)Where can you probably read these ads? (单选题)We can buy the fresh fruit in ______. (单选题)25. （ ） (单选题)24. （ ）