题目

已知某水溶液中大量存在H+、Mg2+、K+、NO3﹣、Cl﹣中的四种离子，且存在的各离子具有相同的物质的量，则不能存在的离子是（ ） A . H+ B . Mg2+ C . Cl﹣ D . NO3﹣ 答案：BIt is April 10. It is Tuesday. Cindy gets up at 6:30 in the morning. She is in her blue skirt. She really likes that skirt. Then she goes into the kitchen. She loves eggs and apples in the morning.Cindy’s mother is a teacher at her school. Cindy is in the second grade (年级), and her mother teaches the fourth grade. Cindy is excited (兴奋) about going to school today because her class has a test (测试). Cindy loves school and she likes to get good grades (成绩). Cindy eats her breakfast and then she and her mother go to school. Cindy goes to her classroom and her history teacher, Ms. Brown is there. It is fun to be in Ms. Brown’s class. She is a great teacher. Now Cindy’s classmates are all in the classroom, and they start the test. Cindy remembers (记得) everything, so she can do everything right. After the test, Cindy and her classmates play for a long time. Then they eat lunch. After lunch, they watch a funny movie (电影). Then they draw pictures. It is really a great day!1.What grade is Cindy in?A.Grade OneB.Grade TwoC.Grade ThreeD.Grade Four2.What does Cindy like to eat for breakfast?A.Eggs and applesB.Milk and bananasC.Eggs and carrotsD.Chicken and apples3.-Why is Cindy excited about going to school today?    -Because they have ____A.a tripB.a partyC.a movieD.a test4.What do the children do after the test?A.They swimB.They draw picturesC.They playD.They watch a movie5.Which (哪个) is right according to the passage (根据短文)?A.Cindy likes the blue shirtB.Cindy is a good studentC.Cindy’s mother is a teacher of historyD.It’s really boring that day