问题 填空题

某科研小组从含有较多Ag+、Fe3+、Al3+的工业废水中,按下图所示方法分离和提取金属单质:

已知:实验室甲、乙、丙、丁四种物质只能从氨水、碳酸铵、氢氧化钠、稀硫酸、葡萄糖五种溶液中选择,也可以用这五种溶液来制备。

对该实验分析正确的是

A.金属A、B、C分别为Ag、Fe、Al

B.g、f都为氧化物,工业上均采用电解g与f获得对应金属单质

C.沉淀b为混合物,主要成分为沉淀d和沉淀e

D.甲是氢氧化钠,丁为稀硫酸

答案

答案:C

题目分析:根据所给的试剂和流程图可以得出:

又图可知,C正确。

单项选择题 B型题
完形填空

第二节:完形填空(共20小题;每小题1.5分,满分30分)

阅读下面短文,掌握其大意,然后从36~55各题所给的四个选项(A、B、C和D)中,选出最佳选项。

The Pecan (山核桃) Thief

When I was six years old, I was visiting my grandfather’s farm in Kansas. Grandpa had sent me into the 36 to gather pecans for us to enjoy later.

Pecan picking was really 37 work and my little basket was only half full. I wasn’t about to 38 Grandpa down. Just then something caught my 39. A large brown squirrel was a few feet away. I watched as he picked up a pecan, hurried to a tree and 40 in a large hole in the trunk. A moment later the squirrel 41 out and climbed down to the ground to pick up another nut. Once again, he took the pecan back to his hiding place.

The hiding place was not so 42 anymore, I thought. I dashed over to the tree and looked into the hole. It was 43 with pecans! Golden pecans were right there for taking. This was my 44. Handful by handful, I scooped all of those pecans into my basket. Now it was full! I was so 45 of myself. I couldn’t wait to show Grandpa all the pecans. 46, I ran back and shouted, “Look at all the pecans!” He looked into the basket and said, “Well, well, how did you find so many?” I told him how I’d 47 the squirrel and taken the pecans from his hiding place.

Grandpa congratulated me on how smart I’d been in observing the squirrel and his habits. Then he did something that 48 me. He handed the basket back to me and put his arm gently 49 my shoulders.

“That squirrel worked very hard to gather his winter 50 of food,” he said, “Now that all of his pecans are gone, don’t you think that little squirrel will 51 the cold winter?”

“I didn’t think about that,” I said.

“I know,” Grandpa said. “But a good man should never take 52 of someone else’s hard work.”

Suddenly I felt a bit 53. The image of the starving squirrel wouldn’t 54 my mind. There was only one thing I could do. I carried the basket back to the tree and poured all the nuts into the hole.

I didn’t eat an pecan that night, but I had something much more filling — the 55 of knowing I had done just the right thing.

36. A. rooms                 B. woods                      C. holes                        D. roads

37. A. hard                   B. dirty                        C. light                        D. easy

38. A. let                      B. settle                        C. have                        D. keep

39. A. sweater               B. basket                      C. eye                          D. hand

40. A. joined                 B. lived                        C. discovered                D. disappeared

41. A. jumped               B. held                         C. stood                       D. found

42. A. strange               B. secret                       C. anxious                    D. patient

43. A. covered              B. filled                       C. rebuilt                      D. decorated

44. A. turn             B. choice               C. chance              D. achievement

45. A. afraid                 B. ashamed                   C. careful                     D. proud

46. A. Otherwise           B. However                  C. Besides                    D. Therefore

47. A. driven                B. followed                  C. protected                  D. caught

48. A. annoyed              B. satisfied                   C. surprised                  D. delighted

49. A. off                     B. besides                     C. over                         D. around

50. A. supply                B. cost                         C. price                        D. quality

51. A. escape                B. get                           C. survive                     D. fled

52. A. place                  B. notice                      C. advantage                 D. charge

53. A. guilty                 B. curious                     C. happy                      D. excited

54. A. open                   B. leave                        C. cross                        D. close

55. A. inspiration          B. expectation               C. impression                D. satisfaction