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
What determines the shape of snowflakes
A．The shape of dust particles in the air.
B．The relative humidity.
C．The temperature of the air.
D．The geography of the area.
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.
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