目前人口超过1亿的亚洲国家有（ ）
A．4个
B．5个
C．6个
D．个
答案：C
已知锐角α满足tan（α-20°）=1，则锐角α的值为（ ）
A．50°
B．25°
C．45°
D．65°
—Where's your father?
—He ______ to work.[ ]
A. has gone
B. went
C. has been
D. will go
