题目

右图为甲、乙两物质(均不含结晶水)的溶解度曲线，下列说法错误的是(    )   A．20℃时，100g甲溶液中含甲物质的质量小于25g   B．20℃时，等质量甲、乙饱和溶液中含溶质的质量相等   C．30℃时，甲物质的溶解度大于乙物质的溶解度   D．50℃时，将甲、乙两种物质的饱和溶液分别降温至20℃，析出晶体的质量甲大于乙Look at the notice from the Students’ Union. It’s a description of students’ activities for the coming winter vacation.Winners of Super Boys will come to our school on January 30th, 2014. They are going to give a concert in the school hall at 2:00 pm. Please come to the Students’ Union to get a half-price ticket to the concert before this Friday.Wouldn’t it be great if you could join us and go hiking around the West Hill for two days? We’ll start at 7:00 am on February 6th. Please come to the Students’ Union to sign your name and pay fifty yuan, 20 percent off for members of the Hiking Club.Are you interested in being a volunteer? We’ll go to a mountain village to give away books to the children there. We’ll work and study with them for a whole day. Please come to the school gate at 6:00 am on February 13th, 2014. Free of charge(免费).We’ll hold a party for the students who come from poor families and have to stay at school during the winter vacation. Would you like to join us? Please come to the reading room at 5:00 pm on January 28th.1.The notice is about .A. free tickets B. students’ activitiesC. the West Hill D. poor children2.Betty likes music and wants to go to the concert, so she must arrive at the school hall before on January 30th, 2014.A. 2:00 pm B. 7:00 am C. 6:00 am D. 5:00 pm3.If you are a volunteer, you will go to a mountain village .A. on January 30th B. on February 6thC. on February 13th D. on January 28th4.If you want to take part in a party for poor students, you should go to on January 28th.A. the school hall B. the West HillC. a mountain village D. the reading room5.How much will Tom, a member of the Hiking Club, pay if he wants to go hiking around the West Hill?A. 2 yuan. B. 50 yuan. C. 40 yuan. D. Nothing.