—Who is Tina?
— _____ girl next to the table. [ ]
A. A
B. The
C. An
D. /
答案:B
一元二次方程x2+x=0的根是______.
睡眠的发动与维持困难()
A.失眠
B.睡眠-觉醒节律障碍
C.做梦
D.嗜睡
E.睡行症