2022英语周报七年级HNY答案

One possible versionThe Most Beautiful Place in My HeartAs a 17-year-ol teenager, I ve been to many great cities, among which Luoyang is the most beautiful one inlocated on the north bank of the luo river in western Henan pruvinee l aovany is surrounded by mountains on threesidles, high in the west and low in the east. At the end of 2019, Luoyang had a population of more than 7. I millionI love Luoyang so much due to the fact that as one of the four ancient capitals of China, Luoyang has a civilizationhistory of 5, 000 years. Whats more, the number of its heritage sites is second only to Beijing in cities of China. And itfamous tourist attractions inelude Lungmen Grottoes, Baima Temple, Guanlin and so on

4.B设流过金属杆中的电流为I,由平衡条件得mg1BL,得=2mB,所以R中的电流大小=2mg,选项A错误;设杆匀速运动时的速度为v,BL由E=BL3RR,E=IR总,得LB2L2,选项B正确;mg2Q=1m2,得Qmgr2- R2BL4,选项C错误;金属杆穿过整个磁场过程中流过电阻R上的电量q=4②RBL6R选项D错误

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