单项选择题

Cairo is______.

A．the largest city in three continents
B．the financial center of the world
C．the' capital of Egypt
D．the youngest city in middle east
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单项选择题
The U.S. achieved its predominance after World War Ⅱ because ______.
A．it had made painstaking efforts towards this goal
B．its domestic market was eight times larger than before
C．the war had destroyed the economies of most potential competitors
D．the unparalleled size of its workforce had given an impetus to its economy
单项选择题
Most Americans think that solid growth in 1990s can be attributed to the fact that _____.
A．American industries have optimized structure to meet new demands
B．US businesses have improved productivity
C．US businesses enjoy better management than their overseas rivals
D．all of the above
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