仁爱版九年级下Unit5 Topic 2 Section D课时作业含答案
( )1.--- Did anyone hurt in the accident? --- Yes. Jack is the boy ________ arm was hurt in the accident.
A. whose B. whom C. which
( )2.--- Could you tell me _______? --- In the Song Dynasty.
A. when was printing invented B. when printing invented C. when printing was invented
3. Many _________(发现) were made with the help of compass.
4. Paper-making was developed in the _________(东) Han Dynasty by Cai Lun.
5. The camera was one of the greatest _________________ (发明) in the 19th century.