| 41. | Send me this sample in double . |
| 把样品送两份给我。
|
| 42. | The fire engines came on the double . |
| 救火车很快就来了。
|
| 43. | Ten is the double of five. |
| 10是5的两倍。
|
| 44. | She is the double of her sister. |
| 她和他的妹妹像极了。
|
| 45. | The teacher told John to double back the sheet and tear it in half. |
| 老师叫约翰把那页纸对折，撕成两半。
|
| 46. | The carpet is too thick to double up. |
| 这地毯太厚，折不起来。
|
| 47. | When relatives came for a visit, Anne had to double up with her sister. |
| 亲戚们来访时，安妮只得和妹妹挤住在一室。
|
| 48. | Come on, you fellows! Double up! |
| 来吧，伙计们，赶快！
|
| 49. | Who will double for the typist while she is on holiday? |
| 打字员休假时由谁来代替？
|
| 50. | Can any of the players double in brass? |
| 演奏者中有能演奏一种以上乐器的吗？
|