⑴____ A. mine B. live C. white D. Mike
⑵____ A. milk B. kite C. finish D. give
⑶____ A. this B. sign C. with D. little
⑷____ A. sorry B. note C. home D. cold
⑸____ A. hobby B. piano C. over D. comb
Is Mary?( )
如图所示,匀强磁场与圆形导体环平面垂直,导体ef与环接触良好,当ef向右匀速运动时( )