第一颗萌出的恒牙叫（）。
A.第一横磨牙
B.第一上尖牙
C.第一中切牙
D.第一下尖牙
参考答案：A
—Excuse me!
—________.
—Could you tell me how I can get to the first department?
A．Pardon?
B．Why?
C．Yes?
D．Please.
---I’m going to Hangzhou for a holiday this weekend.
--- ___ you are there, could you buy me some green tea?
A．Because
B．While
C．During
D．As
