（1）下列所示的粒子结构示意图中，属于同一种元素的是 （填序号）．
（2）金属材料在生产、生活中应用非常广泛．
①钢铁是重要的金属材料，它属于 （填“纯净物”或“混合物”）．
②工业上用一氧化碳和赤铁矿（主要成分为氧化铁）冶炼铁，其反应的化学方程式是 ．
③某同学为了验证Fe、Zn、Cu三种金属的活动顺序，设计了如下一组实验：
A、将锌片浸入稀硫酸溶液中；
B、将铜浸入稀硫酸溶液中；
C、将锌片浸入硫酸亚铁溶液中．
该组实验还不能完全证明三种金属的活动性顺序，需要补充一个实验才能达到目的，你认为应该补充的实验是 ．
（1）②③；
（2）①混合物
②3CO+Fe2O3
2Fe+3CO2；
③将铁片浸入硫酸铜溶液中（或将铁片浸入稀硫酸溶液中；或将铜片浸入硫酸亚铁溶液中等．答案合理即可）
完形填空。 |
| Mrs. Brown has a small 1 in front of her house. In spring she plants some 2 in it." She looks 3 them very carefully. When summer comes, they look very nice. One evening Mrs. Brown looked at her vegetables and said "Tomorrow I am going to pick 4 , and then we can eat them." But early the next morning, her son 5 into the kitchen and shouted, "Mother, Mother! Come quickly! Our neighbor's ducks 6 in the garden. They are eating our vegetables!" Mrs. Brown ran 7 but it was too 8 ! All the vegetables were eaten up! Mrs. Brown cried and her neighbor was very 9 , but that was the end of the vegetables. Then a few days before Christmas, the neighbor brought Mrs. Brown a parcel (包裹). There was a beautiful fat duck in it, and it was a piece of paper 10 the words "Enjoy your vegetables!" |
| ( )1. A. shop ( )2. A. trees ( )3. A. at ( )4. A. her ( )5. A. jumped ( )6. A. am ( )7. A. in ( )8. A. late ( )9. A. sorry ( )10. A. at | B. marks B. vegetables B. over B. them B. ran B. is B. out B. later B. happy B. with | C. garden C. apples C. after C. they C. looked C. are C. to C. early C. hungry C. to | D. house D. flowers D. up D. she D. had D. be D. from D. earlier D. smile D. from |