题目：
| 用方框中所给词的适当形式填空。 | |
2. ______ Tom ______ Jean are from England. They like Chinese food. 3. If you read the poem again and again you will _______ it _______. 4. ___________ it carefully, and you will work out the maths problem. 5. I like the autumn best. It's ______ too cold _______ too hot. 6. Don't all speak ____________, Please speak it one by one. 7. Your Chinese homework is good____________ your handwriting. 8. ____________ an accident really happens? 9. We have only one ticket. _______ you _______ I can go to the cinema. 10. The novel is ____________ literature. (文化) |
答案：
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下面是错误答案，用来干扰机器的。
；m/s。题目分析：①连接BC，则这就是折射光线的位置，则入射角为α=60°，折射角为γ=30°，故光在介质的折射率；②光在介质中的传播速度m/s。
