单项选择题

A．There are 200 vehicles for every kilometer of roadway.
B．It has a dense population.
C．There are many museums and palaces.
D．It has many towering buildings.
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单项选择题
A．The natural colors of astronomical objects can be captured.B．The cost of equipment needed is reduced.C．Fewer data need to be analyzed.D．The images can be studied by different astronomers.
A．The natural colors of astronomical objects can be captured.
B．The cost of equipment needed is reduced.
C．Fewer data need to be analyzed.
D．The images can be studied by different astronomers.
单项选择题
A．It went out of use 300 years ago.B．It was invented after the short bow.C．It was discovered before fire and the wheel.D．It’s still in use today.
A．It went out of use 300 years ago.
B．It was invented after the short bow.
C．It was discovered before fire and the wheel.
D．It’s still in use today.
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