They usually go shopping____ their lunch break.
A:against
B:among
C:between
D:during
一天晚上放学时,小华一个人在路上行走,一个陌生人紧随其后向他问路,并递给他一个面包。小华的正确做法是( )
He ____ (not go) to bed at 8:30.
She ____ (do) her homework at 7:00 in the evening.
Scott ____ (work) very long hours.
What time ____ you usually ____ (get) up?
I’m the last one ____ (take) a shower.
My father ____ (watch) TV in the evening.
半径为a的圆形区域内有均匀磁场,磁感应强度为B=0.2T,磁场方向垂直纸面向里,半径为b的金属圆环与磁场同心地放置,磁场与环面垂直,其中a=0.4m,b=0.6m.金属环上分别接有灯L1、L2,两灯的电阻均为R=2Ω,一金属棒MN与金属环接触良好,棒与环的电阻均忽略不计.