We ______English lessons on Saturday morning.
A:don't have
B:haven't
C:aren't have
D:no have
—Excuse me, __________—Go along this street to the end, you will see it on your left. ( )
香港人多地狭,扩展城市建设用地往往采用“上天”、“下海”的方式,对这两种方式的正确理解是( )
①建设高层建筑 ②居住在船上 ③向月球移民 ④填海造陆。
关于静电场场强的概念,下列说法正确的是( )