2 英语周报 七年级新目标（JYY）答案

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1.【答案】CD【解析】金属棒加速运动过程中,由于速度与位移成正比,不是与时间成正比,可知金属棒不做匀变速直线运动A项错误:当金属棒的速度为2m时电路中的电流1=号,安培力FA=BL=0.5N,由于金属棒做加速运动,因此拉力大于0.5N,B项错误;通过电阻R的电量qBLxbLu bLix=+=0.25C,C项正确;金属棒加速过程中,=kx,F、=R+,克服安培力做功为W12+=}J,根据对称性整个过程克服安培力做功W=2W=5J,根据功能关系,整个电路产生的焦耳热Q=W=J根据Q:Q=R:r,可知电阻R中产生的焦耳热e≈5J,D项正确。

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!

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