常温下，下列各组离子在指定溶液中一定能大量共存的是
A．能溶解Al2O3的溶液：Na+、K+、HCO3-、NO3-
B．0．1mol·L-1Ca(ClO)2溶液：K+、Na+、I-、Cl-
C．能使甲基橙显红色的溶液：K+、Fe2+、Cl-、NO3-
D．加入KSCN显红色的溶液：Na+、Mg2+、Cl-、SO42-
答案：D
题目分析：A、能溶解Al2O3的溶液既可能为强碱溶液，又可能为强酸溶液，强碱性条件下，OH－与HCO3-反应生成碳酸根和水；强酸性条件下，H＋和HCO3-反应生成二氧化碳和水，不能大量共存，错误；B、0．1mol·L-1Ca(ClO)2溶液中，I-和ClO-发生氧化还原反应，不能大量共存，错误；C、能使甲基橙显红色的溶液呈酸性，酸性条件下H＋、NO3-和Fe2+之间发生氧化还原反应，不能大量共存，错误；D、给定条件下，组内离子间不反应，能大量共存，正确。
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| One day at the end of the class, a wise teacher told each of her students to 1 a plastic bag and a bag of potatoes to school. The next day she told her students: "From today on, for every person you don't like in your lives, you can choose a potato, write the person's name and the date 2 it and then put it in the plastic bag." Day after day, some of the students' bags were very 3 . They were then told to carry this bag with them everywhere they went for a week. They would put it inside their quilts 4 , on the seats when sitting in a car or on a bus , and next to their desks at school. The days carrying the bag around with them 5 students get to know what a weight they were carrying in their minds. They had to pay attention to it all the time 6 they wouldn't forget it. As time passed by, the potatoes went bad and 7 nasty(恶心). They all tried to get rid of them. Too often we think of tolerance(宽容) as a gift to 8 people, and it clearly is for ourselves! If we choose to keep our sadness and hatred(仇恨)in our 9 , we will have to carry them around all our lives. Do you think you have got 10 from the wise teacher and what she asked her students to do? | |||
| ( )1. A. take ( )2. A. in ( )3. A. heavy ( )4. A. in the morning ( )5. A. kept ( )6. A. as soon as ( )7. A. sounded ( )8. A. another ( )9. A. hands ( )10.A. anything | B. bring B. at B. strong B. in the afternoon B. made B. since B. tasted B. other B. eyes B. nothing | C. put C. on C. light C. during the day C. asked C. so that C. smelt C. the other C. stomachs C. somebody | D. show D. with D. big D. at night D. allowed D. until D. felt D. others D. hearts D. Anybody |