写单词。
1. Can you name the four great ___________(发明) of China?
2. About ten ___________(百分之) packaging is plastic.
3. The Rocky ___________(山脉；山峰) are the biggest ones in North America.
4. ___________(地理) is the study of the world's places.
5. We ___________(成功) to have the broken bike repaired well. We are very happy.
6. Maybe in the future all the cars, buses will be ___________(电的)
7. We use wood from trees to build houses and ___________(家具)
8. The rose is one of the ___________(漂亮) plants in the world.
9. Let's do the ___________(试验) and see what happens.
10. ___________(保护) the environment is everyone's duty.
，则1min内产生的热量为2904J
过