口角正常的位置在()。
A.位于外眦垂直线上
B.位于内眦垂直线上
C.位于侧切牙与尖牙之间
D.位于尖牙与第一前磨牙之间
E.第一前磨牙与第二前磨牙之间
参考答案:D
—The T-shirt is only ten dollars.
—I'll _______ it. [ ]
A. buy
B. take
C. sale
D. sell
–We can use it to chat with each other on the Internet.
--Really? Will you please show me _______ it
A.how to use
B.what to use
C.how can I use
D.what can I use