| 单项选择。 |
| This river is ____ than that one. |
A. deep and clean B. deeper and cleaner C. deeper and clean D. deep and cleaner |
| 单项选择。 |
| There are ____ of students in the meeting-room. |
A. hundred B. hundreds C. a thousand D. thousand |
| 单项选择。 |
| He is writing a ____ article (文章). |
A. two-thousand-word B. two-thousands-words C. tow-thousands-word D. two-thousand-words |