2022英语周报OT答案

17.B【解析】设B球的质量为m,A、B碰撞过程中,对二者组成的系统由动量守恒定律得3×6+m×1=3×2+m×7,解得m=2kg,A项错误;由动量定理可知,碰撞过程中A球对B球的冲量大小为Ⅰ=△p=2(7-1)N·s=12N·s,B项正确;A、B两球碰撞前的总动量为力=(3×6+2×1)kg·m/s=20kg·m/s,C项错误;碰撞过程中两球损失的机械能为△E3×62+×2×12)J×3×2+×2×72)J=220,D项错误。

二、读后续写范文(满分25分)Possible version 1Paragraph 1:It was time to put an end to the Magic Marty show. I walked over. "It was fishing line. " I sneeredfolding my arms. Marty subconsciously fingered the fishing line and nervously whispered, "So, are yougoing to tell people? Seeing the panic in his eyes, somehow, I hesitated. Should I_reveal the secret, Martymight lose his new_ friends. Finally, after struggling for a moment, I replied, "Nah, I won't say anythingMarty let out a relieved sigh, and I turned to walk awayParagraph 2Waitr"Marty jumped in front of me. Unexpectedly, he patted my arm, grinning. "You' ve got a prettygood eye for magic. Want to join me? "I nodded joy fully. That's how the Magic Marty and MysteriousMatt Lunch Show began. Now we've been a magic team for three months. And since I became a fellowmagician, Marty has let me in on some of his other tricks. It turns out that instead of a fake magician, Martyis a real friend.(150 words

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