以下情形中应该选择短渠道的有（）。
A、消费品中的便利品
B、鲜活商品
C、定制产品
D、成熟期的产品
参考答案：B, C
I became a teacher ten years ______. I have been a teacher _______ 2008.
A．ago; for
B．before; since
C．ago; since
D．ago; in
23．Mike must be angry with me, for he walked________me without even saying hello.
A．past
B．on
C．at
D．Over
