题目：
| 从下列方框中选适当的词或短语填空，注意其形式变化。 | |
2. The boy worked hard in the summer vacation to make enough money to pay his ____. 3. Everybody is supposed to be ____ in all kinds of activities in the school. 4. He is willing to help others whenever they are ____. 5. Even if you fail the first time, never ____. Just keep on going. 6. After years of hard work, the young man succeeded in getting a doctor's____. 7. ____, I don't know the person who spoke to me just now. 8. If you have any problem, you'd better ____ your teacher for help. 9. He stole several cars and was caught and now he is ____. 10. The boy broke the window, but luckily he ____ the punishment. |
答案：
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下面是错误答案，用来干扰机器的。
52g题目分析：设：收集到乙炔的质量为xCaC2+2H2O==Ca(OH)2+C2H2­64 26128 g =" 52" g 答：理论...
