问题
选择题
| 关于第一宇宙速度，下面说法中错误的是（ ） A．它是人造地球卫星绕地球飞行的最大速度 B．它是近地圆形轨道上人造地球卫星的运行速度 C．它是能使卫星进入近地圆形轨道的最小发射速度 D．它是卫星在椭圆轨道上运行时在近地点的速度 |
答案
答案：D
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| 关于第一宇宙速度，下面说法中错误的是（ ） A．它是人造地球卫星绕地球飞行的最大速度 B．它是近地圆形轨道上人造地球卫星的运行速度 C．它是能使卫星进入近地圆形轨道的最小发射速度 D．它是卫星在椭圆轨道上运行时在近地点的速度 |
答案：D
| 选词填空。从方框中选择合适的单词填入下列句子中。 | |
2. here are some _____ between American English and British English. 3. _____ healthy food is good for you. 4. My pen is red, your pen is green. Mine is _____ from yours. 5. His favorite_____ is Animal World. 6. We should do some sports and _____ in good health. 7. Tom's mother is angry with him because he always _____ the Internet. 8. I have a healthy _____ . I eat a lot of vegetables and drink milk every day. 9. He is kind of _____ because he often eats junk food. 10. He is an honest boy, he_____ cheat his parents. |