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【单选题】
Continuing from Question#12, if you are told that Country B is very much richer than Country A, then the correct answer is:A.
country A will export good S.
B.
country B will export good S
C.
both countries will export good S.
D.
trade will not occur between these two countries.
E.
insufficient information is given.
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【简答题】to help sb. remember sth. important that they must do
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