哪个牙与相邻恒磨牙的形态相似
A．上颌乳尖牙B．下颌乳尖牙C．上颌乳中切牙D．上颌第二乳磨牙E．下颌第一乳磨牙
参考答案：D
--_____ do you live from your school?
--About ten minutes’ walk.
A．How many
B．How long
C．How far
D．How soon
It's hard to say what kind of person he is.Sometimes he is very friendly; at other times he________
be very cold.[ ]
A. can
B. must
C. will
D. shall
