单项选择题

A．The era during which the railroad was the dominant mode of transportation.
B．The time during which mail was delivered by horse.
C．The point at which airmail began to constitute the bulk of United States’ mail.
D．The time period covered in the museum exhibit.
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单项选择题
A．Heavy traffic in the cityB．Pollution in the city centerC．The inefficiency of public transportD．The high cost of building car parks in the city center.
A．Heavy traffic in the city
B．Pollution in the city center
C．The inefficiency of public transport
D．The high cost of building car parks in the city center.
单项选择题
A．There are fewer tourists.B．The entrance fees are lower.C．The animals are more active.D．There are fewer insects.
A．There are fewer tourists.
B．The entrance fees are lower.
C．The animals are more active.
D．There are fewer insects.
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