题目

完型填空.How are you ? It is very nice __1__ you to write __2__me. From your letter I know a lot __3__your school. Now I __4__ you know something about me and my school . I am thirteen years old. I am in Class One ,Grade One. My father is a __5___. He teaches English. My mother is a doctor. She works in a __6_. I __7__early and __8__English. Our school is big. It has 2,000 students and 200 teachers. All the teachers and students work ___9_. Please come and have a look _10__ our school if you have free time.（    ）1. A. of           B. on               C. for  有X、Y、Z三种金属，为判断其活动性顺序，某兴趣小组的同学做了如下实验：①将X、Y、Z分别置于稀盐酸中，X、Y有气体产生，Z无明显现象；②将X金属放入Y的盐溶液中，X表面有Y金属析出，则X、Y、Z的活动性顺序为（ ）A. X＞Y＞Z B. X＞Y＞Z C. X＞Y＞Z D. X＞Y＞Z A 【解析】 将X、Y、Z分别置于稀盐酸中，X、Y有气体产生，Z无明显现象说明Z最不活泼，将X金属放入Y的盐溶液中，X表面有Y金属析出，说明X比Y活泼，故X、Y、Z的活动性顺序为X＞Y＞Z，故选A 。