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．Critical.B．Serious.C．Skeptical.D．Casual.
A．Critical.
B．Serious.
C．Skeptical.
D．Casual.
单项选择题
A．The threat of poisonous desert animals and plants.B．The exhaustion of energy resources.C．The destruction of oil wells.D．The spread of the black soot from the fires.
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black soot from the fires.
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