题目

阅读理解 A year has twelve months. My favorite month is October. October 1st is National Day(国庆节）. We have a seven-day holiday(假期). During the holiday, my parents always take me to see my grandparents. Our school has some interesting things in October. On the 12th , we have a soccer game. I don't love basket ball. It's difficult for me. But I love soccer. I love playing soccer and watching soccer games. We have a book sale on October 20th. I have three old books and I want to sell them. The art festival is fun. We have it on October 29th. My birthday is also on this day. Octobe如图，在数轴上有若干个点每相邻两点之间的距离是1个单位长，有理数a，b，c，d 所表示的点是其中的4个，且在数轴上的位置如图所示．设3a=4b-3，求c+2d的值．