经济学家通常按照竞争程度这一标准，依据不同的市场结构特征，将

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经济学家通常按照竞争程度这一标准，依据不同的市场结构特征，将市场划分为安全竞争市场、垄断竞争市场、寡头垄断市场和完全垄断市场四种类型。下表中空白处的内容自上而下依次应该是

①比较容易 ②比较困难 ③很容易 ④几乎不可能

A．①②③④

B．②③④①

C．③②①④

D．③①②④

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相关试题

When you learn a foreign language, ________you must forget your own one.

A．above all	B．after all
C．in all	D．at all

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Italians often approach others closely and are moreto touch them.

A．maybe

B．possible

C．likely

D．probably

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Everyone will have to ______ a test before they are admitted to the university.

A．come through	B．look through
C．pull through	D．go through

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--Haven’t seen you for ages! Where have you been, anywhere?
--I _______ to New York City. I just got back.

A．have been sent	B．was sent
C．had been sending	D．would be sent

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A new_____to teaching English is being used here, and it has proven to be very helpful to the students.

A．way

B．system

C．approach

D．method

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