单项选择题

On what does the efficiency of a nation depend

A．Every individual.
B．Its machines.
C．Its wealth.
D．Its power.
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单项选择题
In the building of the rail lines, ______.
A．more equipment made in China should be used
B．more imported equipment should be used
C．more exported equipment should be used
D．more equipment used in infrastructure projects should be used
单项选择题
The management system of the rapid transit rail lines ______.
A．is already quite developed
B．does not exist at all
C．is not good enough
D．needs to include the strict guidelines
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