2022英语周报七年级新起点答案

One possible versionThen I wondered whether the man would still be at the same spot. I walked out the doorand back to the street where I had met him. There the man was, at the same spot, knees curledup against his chest, with the same cardboard sign shading his head. I walked down the street,and before I could think twice, I stood before him. He cautiously glanced in my direction.Ismiled and held up the lunch bag. "I brought you some lunch, "I saidI handed him the bag, and he looked closely at it. " Thank you for this. I was praying thismorning, asking for someone,s heart to open. We talked for a little while. As he shared hisstory, there was an, open, honest tone in his voice. There was something about giving thatmade me feel like I was talking with a brother. "I hope you have a nice day, "I told him<"Thank you! It's already gotten a lot better, " he said. As I walked by, his thank fulness hadbecome mind. My day, too, had already gotten a lot better. Anything helps, indeed

21.AB解析:本题考查动量守恒定律。弹簧恢复原长时,由动量守恒定律,有(m1+m2)=mvB,即vB四塵w。然后弹簧伸长,到弹簧最长时,两木块速度相等;弹簧再次恢复原长时,有m2w=m1+m2,m2=m2+m2a2,解得2=m工mm2+m2w。由此可知,当m≥m2时,w≤0,即木块B有速度为零的时刻,A、B项正确。

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