河南偃师二里头遗址，是我国已知最早的宫殿遗址。 ( )
参考答案：对
It's hard to say what kind of person he is.Sometimes he is very friendly；at other times he________be
very cold.[ ]
A．can
B．must
C．will
D．shall
不论单位还是个人，签发支票的金额都不能超过银行存款余额。( )
