下列属于合法的Java标识符的是( )。
A．"ABC"
B．Saler
C．&5678
D．+rriwo
参考答案：B
My sister and I look different _____ we are twins. [ ]
A. as
B. though
C. because
D. and
为实现分页式虚拟存储，页表中至少应包含哪些内容
