单项选择题

In recent years, railroads have been combining with each other, merging into super-systems, causing ______ concerns about monopoly.

A．enhanced
B．curbed
C．disrupted
D．heightened
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单项选择题
High production rates are often achieved at the ______ of quality of work.
A．expense
B．exposure
C．expansion
D．expectation
单项选择题
Credit creates the ______ that you can own things without paying for them.
A．vision
B．image
C．impression
D．illusion
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