在某容积一定的密闭容器中，可逆反应：A（g）+B（g）⇌XC（g）；△H＜0符合图象（Ⅰ）所示关系，由此推断对图象（Ⅱ）的正确说法是（　　）

一张电影票5元，小明拿出18元钱，买4张票够吗？

在下列各数：0.51525354…，$\sqrt{\frac{49}{100}}$，0，2，$\frac{1}{\mathrm{\pi }}$，$\sqrt{7}$，$\frac{131}{11}$，$\sqrt[3]{27}$中，无理数的个数是（  ）

将一个半径为2cm的圆分成3个扇形，其圆心角的比1：2：3，求：

（1）各个扇形的圆心角的度数．

（2）其中最大一个扇形的面积．

    Jack1in a small town in England.He always stayed in England2 his holidays, but last year he thought, “I've never been to3countries. All my friends have been to Spain，4they like it very much, so this year I'm going there, too.” So he got on a5to Spain and6at the airport of the capital, Madrid, and stayed in a hotel for a few days. On the first morning he went7for a walk. In England people drive on the left, but in Spain they drive on the right. Jack forgot about this, so8he was walking on a busy street, a bicycle knocked him down.

    Jack 9on the ground for a few minutes and then he sat up and said, “Where am I？”

    Just then an old man selling maps went past him. When he heard Jack's words, he said to him10, “Maps of the city, sir？”