问题
填空题
在 ①钓鱼竿、②天平、③羊角锤、④理发剪刀、⑤缝纫机踏板、⑥铡刀、⑦瓶盖扳子 等简单的机械中，属于省力杠杆的有________ ，属于费力杠杆的有________ ，属于等臂杠杆的有________ ．
答案
羊角锤、铡刀、瓶盖扳子；钓鱼竿、理发剪刀，缝纫机踏板；天平
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在 ①钓鱼竿、②天平、③羊角锤、④理发剪刀、⑤缝纫机踏板、⑥铡刀、⑦瓶盖扳子 等简单的机械中，属于省力杠杆的有________ ，属于费力杠杆的有________ ，属于等臂杠杆的有________ ．
羊角锤、铡刀、瓶盖扳子；钓鱼竿、理发剪刀，缝纫机踏板；天平
| 选词填空，从方框中选择合适的单词填入下列句子中，每次只用一次。 | |
2. The idea seems fine, but we need to ______ it ______ in practice. 3. ______ the satellites, we are learning more and more about the universe. 4. These skirts don't fit me. They are ______ too long ______ too short. 5. I think there is a train at 7:30. But you'd better ______. 6. I must leave home ______, or I'll be late for school. 7. He ______ smoke a lot, but now he doesn't. 8. It's difficult for us to ______ a conversation in such a noisy room. 9. People in China ______ Yang Liwei's successful flight into space. 10. Speaking is ______ important ______ reading in learning English. |