There _____ many cars on the road.
A:is
B:be
C:are
— Do they have a computer?
— _________.
我国四大地理区域特征叙述正确的是( )
如图所示,环形导线周围有三只小磁针a、b、c,闭合开关S后,三只小磁针N极的偏转方向是( )