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【多选题】
下列关于暂准进出境货物期限的表述正确的是：（ ）A.
实用ATA单证册报关的货物暂时进出境期限为自货物进出境之日起6个月，超过6个月的，可以向海关申请延期，延期最多不超过3次，每次不超过6个月
B.
参加展期在24个月以上展览会的展览品，在18个月延长期届满后仍需要延期的，由海关总署审批
C.
境外集装箱箱体暂准进境，应当自入境之日起6个月内复运出境，特殊情况经海关核准可以延期，延长期最长不超过3个月
D.
国家重点工程，国家科研项目使用的暂时进出境货物，在18个月延长期届满后仍需要延期的，由海关总署审批
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【单选题】Why would policy makers need to regulate all firms that produce differentiated products?
A.
Because such products are so common in the economy.
B.
Because there is no easy way for policymakers to fix the problem.
C.
Because they want to enforce marginal-cost pricing.
D.
Because monopolistic competitors are making zero profits.
【单选题】听力原文：We've been living through times of plenty in recent decades, but no more. World grain sup- plies are low, there's just forty days' worth in stock and the long-term future looks bleak. Our demand ...
A.
There is plenty of grain in the world and people need not to worry about it.
B.
The world's population is estimated to explode from over 6 billion now to 19 billion by 2050.
C.
The population increase is mainly in undeveloped countries.
D.
World demand for foods is predicted to rise 50% by 2030.
【单选题】It has been challenging for most twentieth-century American policy-makers to recapture the memory of the early United States, Constitution and all, as a revolutionary force-to ascertain, in other word...
A.
Ⅰ only
B.
Ⅱ only
C.
Ⅰ and Ⅱ only
D.
Ⅱ and Ⅲ only
E.
Ⅰ,Ⅱ, and Ⅲ
【单选题】. A look at recent trends in world fisheries reveals ________ the ocean on a global scale.
A.
how we have swiftly affected
B.
that how swiftly we have affected
C.
how swiftly we have affected
D.
however swiftly we have affected
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