单项选择题

What conclusion can we draw from this conversation

A．Public buses are fast and cheap.
B．Parking is becoming a big problem.
C．Subway trains are even safer than taxis.
D．Taxis are more convenient than buses.
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单项选择题
A．repressesB．suppressesC．depressesD．expresses
A．represses
B．suppresses
C．depresses
D．expresses
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What is the most dangerous thing about nitrous oxides
A．Stagnant air.
B．Damage to concrete.
C．Unfounded fears.
D．Potential carcinogenic effects.
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