【单选题】What is the passage mainly about
A．Several worldwide economic problems.
B．The causes and consequences of trade deficit.
C．Lack of resources in underdeveloped countries.
D．The value of exports against imports.
【单选题】What is the passage mainly about
A．Several worldwide economic problems.
B．The causes and consequences of trade deficit.
C．Lack of resources in underdeveloped countries.
D．The value of exports against imports.
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