单项选择题

The rapid-transit rail lines should ______.

A．develop as quickly as possible
B．develop with local economic development
C．develop after local economic development
D．develop with the construction industry

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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

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