酵母菌的主要生殖方式是[ ]
A．分裂生殖
D．孢子生殖
C．出芽生殖
D．接合生殖
C
正常成人颈部完全伸展时，甲颏间距应大于（）
A.5.0cm
B.6.0cm
C.6.5cm
D.7.5cm
E.>8.0cm
—Why do you look worried?
—Fred left the company half an hour ago. His work ________ unfinished since.
A．left
B．was left
C．has left
D．has been left
