题目内容

How was the journey?Tiring. I caught the train at the last second, but all the seats ____. I stood all the way.

A. had been occupied
B. had occupied
C. would occupy
D. would be occupied

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He ____ football regularly for many years when he was young.

A. was playing
B. played
C. has played
D. had played

网络经济中的竞争呈现出新的特点，主要有：（）

A. 门槛降低导致竞争更加激烈
B. 竞争使产品的生命周期缩短
C. 竞争方式更趋向于合作式竞争
D. 竞争从产品差异化走向标准化

网络市场与传统的市场类似，呈现垄断特征的原因主要有：（）

A. 资源独享
B. 规模经济
C. 政府扶持
D. 人才竞争

网络经济垄断形成的原因除了与传统市场类似的原因之外，因网络经济的特殊性，其更加内在的原因有：（）

A. 技术垄断
B. 产品标准化
C. 边际效益递增
D. 锁定效应
E. 信息透明性