2022－2022学年九年级外研英语周报答案

10,AB【解析】根据质量效和电荷数守恒可得核反应方程为p+A]—→S,A项正确;核反应过程中的核力远远大于外力,故系统动量守恒,B项正确;核反应过程中系统能量守恒,C项错误;由于反应过程中,要释放大量的能量,伴随着质量亏损,所以生成物的质量小于反应物的质量之和,D项错误。

第四部分写作第一节短文改错Last Friday, we had a PE lesson on theplayground, during that we learned how to do thehichlong jump. After some warming-up exercises, ourexerciseteacher showed us how to do it and asked us to payattentionA safety. Then we followed the teacher andpractised one after other. When it was my turn, Ianotherfeel very nervous. I failed at my first try, and I didn'tbutlose heart. I kept on practise. At last, I jumpedactIsover 2 metres longer. I was exciting that I succeededlong已xThis lesson made me realize that it's true that hardwork will eventually pay A off

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