单项选择题

Medieval cities grew rapidly when they had harbors nearby.

A．merchants
B．castles
C．suburb’s
D．ports
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单项选择题
Due to the tilt of Neptune’s axis, the Sun heats the planet’s northern and southern hemispheres unequally.
A．climates
B．halves
C．atmospheres
D．contours
单项选择题
At first glance, a forest appears to be a haphazard collection of trees, shrubs, vines, and flowers.
A．random
B．total
C．graded
D．natural
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