单项选择题

The economic performance of these three countries may improve because ______.

A．there will be decreased economic activities among them
B．they will pay lower prices for anything they need
C．less goods and services will be sold to each other
D．they will earn more money from what they are trading
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单项选择题
The agreement the three presidents assigned on Tuesday implies that ______.
A．all these three countries enjoy the equal tariff treatment
B．developing countries gain great help from those developed ones
C．it will bring only positive results for the three countries
D．African countries are trying to develop their trade and economy
单项选择题
It can be learned from the passage that the new customs union ______.
A．has no trade barriers at all so that it makes everything flow freely
B．owns more consumers to promote the businesses in these three countries
C．boosts the manufacturing industry of these three countries to develop speedily
D．makes these three countries import more products while export less
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