题目：
| 从方框中选择适当的短语，用其正确的形式填空。 | |
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 _______ moke a lot, but now he doesn't. 8. The future ________ our young people. 9. People in china _______ Fei junlong and Nie haisheng's successful flight into space. 10. Speaking is _______ important _______ reading in learning English. |
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
圆弧形轨道，圆弧半径为R，O为圆心，OA水平，CD是一段水平光滑轨道．一根长为2R、粗细均匀的细棒，开始时正好搁在圆弧轨道两个端点上，现由静止释放细棒，则此棒最后在水平轨道上滑行的速度为__________．
