属脂溶性维生素的是（ ）
A．维生素B1
B．维生素C
C．维生素D
D．维生素B6
E．维生素PP
参考答案：C
Not recognizing me at first, __________.
A．he closed the door
B．the door was closed
C．the door was close
D．I closed the door
回声强度分为4种，即____________、__________、__________及___________等。
