书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

7.B【解析】根据运动学公式v2=2ax可知,图像的斜率为2a,根据图像的斜率变化可知,滑块与水平轨道之间的动摩擦因数一直增大,A错误;由图乙可知,在A处滑块加速度为零,则pAmg=qE,解得pA=0.75,B正确;由于滑块恰能到达D点,则vp=√gR,由功能关系得1mi=-mvb+mg×2R,得v=√gR,则图像中a=5gR,C错误;设滑块在圆弧轨道上等效最低点Q速度最大,如图所示,解得tanθ=x,由动能定理得qERsin0-mxR(1-cos0)≈2m-2mvi,解得vo=llr滑块在圆弧轨道上等效最低点Q时对轨道的压力最大根据牛顿第二定律得F、二%ing- In27得F=4mg,由牛顿第三定律可得滑块在半圆轨道上27对轨道的最大压力为一mg,D错误。故选B。DE

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