单项选择题

How many basic types of snowflakes are there

A．One.
B．Two.
C．Three.
D．Four.
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单项选择题
When was the Tunnel opened to the public
A．In 1990.
B．In 1991.
C．In 1992.
D．In 1993.
单项选择题
How long is the shaft
A．21 miles.
B．23 miles.
C．31 miles.
D．33 miles.
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