题目

盐场晒盐后得到的卤水中含有MgCl2、KCl和MgSO4等物质，它们的溶解度曲线如下图 所示。下列说法中正确的是 A．MgSO4的溶解度始终随温度的升高而减小 B．t1℃时，KCl和MgSO4两种溶液所含溶质质量一定相等 C．t2℃时，100gMgCl2的饱和溶液中含有agMgCl2 D．将t1℃时KCl饱和溶液升温到t2℃，溶液由饱和变为不饱和 答案：DThe Sixth Time I Went to the Principal’s OfficeWhen I was in the seventh grade, I had problems behaving. My heart was in the right place, but Icouldn’t always follow the rules. I played many tricks on my schoolmates. Once, I even pulled a girl’s hairon the school bus to get her attention. As a result, I was repeatedly sent to the office of the principal（校长）.Although I hated going there, I did not hate the principal, Mr. Ratcliff.Mr. Ratcliff was a kind, elderly man. When he spanked（ 打屁股） me for putting some ants into aclassmate’s pencil box, it didn’t hurt at all, but it did hurt my feelings. I thought so much of him andmoments like that seemed to prove I was hopelessly bad.When I got called to Mr. Ratcliff’s office for the sixth time, I had no idea what I had done. I feltdisappointed as I walked down there. I went into his office, sat down, and looked at the floor. Then he saidthe last thing I expected to hear:” Kevin, I’ve heard you’ve been behaving really well lately. I want you toknow how proud I am of you, and I just called you down to my office to give you a peppermint.”“Really?” I was surprised.“Yes. Now you can take that peppermint and go back to class.”I carried the peppermint with me as if it was a gold coin. When I got into my classroom, I bragged （ 吹嘘） to my classmates about my turnaround,excitedly. I wasn’t so bad after all.Mr. Ratcliff was really kind. He made me realize that I was just a kid who had problems with behavior.He bought some peppermints and took the time to notice me when I got something-anything-right. Mr.Ratcliff gave me some hope by giving me some love. I will just remember him for the rest of my life.【1】In his seventh grade, the writer __________.A. hated the principal B. had problems behavingC. always followed the rules D. often helped his classmates【2】How did the writer feel when he went to the principal’s office for the sixth time?A. Lonely. B. Excited. C. Confident. D. Disappointed.【3】The sixth time the writer went to the principal’s office, he got __________.A. a peppermint B. a model bus C. a pencil box D. a coin【4】The writer will always remember Mr. Ratcliff, because the principal __________.A. talked with him in the office B. played games with himC. expected him to be a teacher D. gave him some hope and love