单项选择题

A．London Airport is one of the best airports in the world.
B．One of the busiest airports in the world is London Airport.
C．London Airport is one of the biggest airports in the world.
D．In the world, London Airport is one of the safest airports.
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单项选择题
A．Fire prevention.B．House construction.C．Toxic chemicals.D．Insects Elimination.
A．Fire prevention.
B．House construction.
C．Toxic chemicals.
D．Insects Elimination.
单项选择题
A．Scholarship.B．Language talent.C．Screening system.D．Scholastic ability.
A．Scholarship.
B．Language talent.
C．Screening system.
D．Scholastic ability.
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