下列属于条件运算符的是( )。
A.+
B.:
C.&&
D.>>
参考答案:B
—_____ did you write to your e-friend yesterday?
—For more than half an hour.[ ]
A. How often
B. How much
C. How long
D. How soon
物流消除了商品生产地和消费地之间的所有权间隔、场所间隔和时间间隔。( )