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A．It has many big and beautiful parks.
B．It possesses many historical sites.
C．It is a city of contrasts.
D．It is an important industrial center.
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What do scientists say about the collision of an asteroid with Earth
A．It is very unlikely but the danger exists.
B．Such a collision might occur once every 25 years.
C．Collisions of smaller asteroids with Earth occur more often than expected.
D．It’’s still too early to say whether such a collision might occur.
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