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【单选题】
政府提供国防这类公共物品的原因是 ( )A.
人们对这类物品的评价不高
B.
存在私人企业可以获得的潜在超额利润
C.
搭便车问题会引起由私人市场提供时供给不足
D.
在生产这类物品方面政府比私人企业更有效率
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反馈参考答案：
举一反三
【单选题】1,Choose the best answer What has the woman just done?
A.
The woman has just bought a new car
B.
The woman has just bought a new dress
C.
The woman has just bought a new magazine.
D.
The woman has just bought a new hat.
【单选题】What has the woman mainly been thinking about?
A.
The weather.
B.
A vacation.
C.
Going skiing.
D.
Her studies.
【单选题】听力原文：Seven. What has the woman just bought? Woman: What do you think? I found it in that new department store yesterday. I think it's perfect. It'll keep the sun off my face and it'll go really well w...
A.
&ndsp
B.
&ndsp
C.
&ndsp
【单选题】3 What has the woman decided to do On Sunday afternoon?
A.
To attend a wedding
B.
To visit an exhibition
C.
To meet a friend
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