单项选择题

What is the best title for this passage

A．Stop reading.
B．The Madrid bombings' effect.
C．How to protect yourself on the Metro.
D．Metro service offers.
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单项选择题
From the passage we know that the security measures taken by Metro are ______.
A．in the wake of the Madrid bomb blasts
B．not visible to the passengers or passers-by
C．extensive in its coverage of public areas
D．various ranging from the use of dogs to the access to FBI
单项选择题
The author seems to disapprove of ______.
A．political leaders' attitude to civil defense
B．citizens' awareness of self-protection
C．businesses' emergency plan
D．preparations made for the times of crisis
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