地球上的本初子午线是[ ]
A．南、北半球的分界线
B．南、北纬度的分界线
C．东、西经度的分界线
D．东、西半球的分界线
答案：C
_____ we have enough evidence, we can’t win the case.
A．Once
B．As long as
C．Unless
D．Now that
Look at the photo of the Smiths. _______ happy they are!
A．How
B．What
C．How a
D．What a
