中国筵席起源于（）。
A、众人聚餐
B、宫廷宴会
C、民间聚会
D、祭祀礼俗
参考答案：D
对于正整数n．证明：f（n）=32n+2-8n-9是64的倍数．
According to the weather forecast, which is usually ______ , it will rain this afternoon.
A．exact
B．accurate
C．perfect
D．precise
