2018-2022英语周报七年级31期答案

One possible version:My mom also joined the conversation. " Anahy, I have also noticed that you never pay attention to us, yourbrother or sister. It seems that you have your own little world now and we dont communicate as much as beforebecause of your phone. "I acted as if they were wrong, but then I started to wonder if it was true that I wasbeing impolite.A week later I tried going a whole day without a cell phone and it didn t go that badly. My relativescame over and it was the first time that I wasn't using my phone since I had one. Everyone noticed because theywere asking me about it. It got really annoying because everyone shouted"Wow! Finally you are not using yourphone! "That day I had so much fun because I was actually spending time with my family and paying attention tothem. From that day on, I had a different point of view towards cell phones: Phones really take us away fromthe rest of the world, but we do have to make some time to spend with our family too and don't get stuck withour phones all day.

34.【理远修345万(1)(5分)BCE。。(选对1个得2分,选对2个得4分,选对3个得5分。没选错1个扣3分,最低得分为0分(2)(10分)解(i)若波沿λ轴正方向传播,设波速为,在Δ=0.2内传播距离为△,周期为7,波长为A20,则△k=(n1.5)m=(2+1.5)m(m=0,12,3(1分)=7N(1分)(1分)解得(n=0,1,2,3,…)(1分)30-15当/=0时,周期最大,设为mm,则(1分)(1分)(ⅱ)若波速0=17.5m/s,设=0.2s内传播距离为Δk2,则№=M=3.5m(2分△2=35m=(2分)所以,波沿x轴正方向传播。(1分)

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