2021-2022 英语周报 高考 7答案

mask my weariness, and requested him the same thinUnexpectedly, he took out his mobile phone for me withouthesitation or any probing questions. Dancing in his eyeswas the real kindness that I had been struggling to seek forso long. From that day on, I began helping other strangersin distress, just like the poor-looking but kind man, withthe aim of passing kindness and melting the ice in manypeople’ s hearts第三节One possible versionParagraph 1At that point I saw a young mother with her ttto kids. Ithought that a beautiful woman with charming blue eyesmust be willing to help me. So, with great expectation, Itrotted briskly towards her with an appropriate smile on myface,and requested courteously if she could be kind enoughto make a phone call for me. However, what I saw was awoman's face disfigured by frowns and what I heard was a.sound of dismay and suspicion under her breath. Without aword, she pulled her kids to escape from me, as if scareda murderer. I stood there, motionless, with a blank faceand a sinnking heartParagraph 2Finally a man tearing a cheap T-shirt and dirty jeaneseemed to notice me. I squeezed a smile though it failed to

16.【解析】在加速电压一定时,偏转电压U越大,电子在极板间的偏转距离就越大,当偏转电压大到使电子刚好擦着极板的边缘飞出,此时的偏转电压为最大电压电子加速过程,由动能定理得c1=2m6(1分)电子进入偏转电场做类平抛运动,有L=t(1分)偏转距离y=(1分)根据牛顿第二定律可知a=F=(1分)恰能飞出的条件为y=2(1分)联立解得U2=400V(1分)

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