单项选择题

A．To tell the crab what time it is.
B．To protect the crab from the sunlight and enemies.
C．To keep the crab warm.
D．To be of no real use.
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单项选择题
A．It has a dense population.B．It has many towering buildings.C．There are 200 vehicles for every kilometer of roadway.D．There are many museums and palaces.
A．It has a dense population.
B．It has many towering buildings.
C．There are 200 vehicles for every kilometer of roadway.
D．There are many museums and palaces.
单项选择题
This passage is about a________.
A．law
B．hypothesis
C．guess
D．theory
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