题目：
单词拼写
1.We are all e__________after the journey. No one wants to move a further step.
2. He a__________his wife, and went to the USA to make money.
3.With the development of industry and agriculture, e__________energy is in great need in China.
4. Linda apologized to the teacher for leaving the school without his p___________.
5. The students are asked to c____________their attention on the experient.
6. The retired worker is very ___________(热心的) about neighbourhood affairs.
7. They have ___________(设计) a lot of advanced electric equipment.
8. He is a very strict teacher, but the students ____________(尊敬) him.
9. He is very nice but I don't really find him ____________(有吸引力的).
10. He was surprised that his speech had caused a strong ____________(反应).
答案：
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下面是错误答案，用来干扰机器的。
设子弹的质量为m，木块的质量为M，子弹射出枪口时的速度为v0。第一颗子弹射入木块时，动量守恒 木块带着子弹做平抛运动 第二颗子弹射入木块时，动量守恒 木块带着两颗子弹做平抛运动 联立以上各式解...
