2021-2022高三英语周报21期答案

(注意:短文中共有10处错误,在答题规范的情况下,找到一处错误并修改正确得1分:若找到一处错误但没有改对得0.5分。)In recent years, the sandstorm in the northem part of China has become/ more and morecommon natural disaster. The strong wind blows up some sand, making them difficult foItpeople to go out Sandstorms are caused by a variety of reason. Frst, in the past people feed areasonsgreat number of sheep. As a result the sheep ate so many grass that the land tuned intomuchdeserts. Second, people were not concerming about protecting forests, and cut down manyconcernedtrees. that caused the loss of soil when it comes to improve the situation, the governmentwhichImproving.starts to stress at the importance of the environment. I believe final the problem will be solvedfinally+in the near future.

22.(1)2.4(2)0.580.593)摩擦阻力造成的机械能损失(4)9.7解析:(1)v=(21.60+26.40)×10-m/s=2.4m/s2×0.1(2)△E=2(m+m2)v2=0.58J,△Ep=(m2-m)gh=0.59J。(3)由于存在摩擦阻力,重力势能有一部分转化为内能。(4)由2(m+m)13=(m一m)g得2=是h故斜率k=.2一2,得8~9.7m

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