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【单选题】
网络成瘾：是指个体反复过度使用网络导致的一种精神行为障碍，表现为对使用网络产生强烈欲望，突然停止或减少使用时出现烦躁、注意力不集中、睡眠障碍等。 以下属于网络成瘾的行为症候的是（ ）。
A.
小兵高考之后，父母对其上网不再过问，他一不上网就感到精神恍惚
B.
学生张某勤工俭学，为某网吧做管理员。全部业余时问都在网吧，经常睡眠不足
C.
某公司销售部经理整天泡在网上，联络客户、处理订单、工作压力大，使他有些烦躁
D.
某职业技术学院电子商务专业的几位学生合伙开了电子购物网站，生意火爆，几乎没时间下线，老师说他们上课都有点心不在焉
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