Jim knows little about computer,so his wife thinks he can't ______the development of times.
A:keep pace with
B:take advantage of
C:throw light on
D:put emphasis on
看图,把图片和适当的短语搭配起来。
① ____ ·A.have a headache
② ____ ·B.have a toothache
③ ____ ·C.have a cold
④ ____ ·D.have a fever
如图,一闭合的小金属环用一根绝缘细杆挂在固定点O处,使金属圆环在竖直线OO′的两侧来回摆动的过程中穿过水平方向的匀强磁场区域,磁感线的方向和水平面垂直.若悬点摩擦和空气阻力均不计,则( )
John ________ his grandma every day when she was in hospital.