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【单选题】
Heavy traffic on the Mississippi River brought affluence to Keokuk, Iowa, until the mid-ninth century, when the arrival of the railroads diverted river shipping.
A.
commerce
B.
development
C.
tourism
D.
wealth
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
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A.
material
B.
surpose
C.
essence
D.
content
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A.
subject
B.
structure
C.
slogan
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slot
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A.
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C.
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A.
stacks
B.
stalls
C.
residences
D.
stadiums
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A.
gems
B.
stationeries
C.
chemicals
D.
components
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A.
cluster
B.
pack
C.
herd
D.
flock
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A.
effort
B.
intellct
C.
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D.
indication
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A.
morality
B.
scent
C.
moan
D.
narration
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A.
Despair
B.
Dismay
C.
Disgust
D.
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A.
happiness
B.
bitterness
C.
gratitude
D.
excitement