单项选择题

A．it is dirty and boring.
B．He has to work all day long.
C．He earns less than he should have earned.
D．He sometimes has to work in bad weather.
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单项选择题
A．On a mountain trail.B．In a classroom.C．At a weather station.D．At a planetarium.
A．On a mountain trail.
B．In a classroom.
C．At a weather station.
D．At a planetarium.
单项选择题
A．Whether or not snowflakes can be analyzed.B．How snowflakes are formed.C．What causes a snowstorm.D．Where the largest snowflakes can be found.
A．Whether or not snowflakes can be analyzed.
B．How snowflakes are formed.
C．What causes a snowstorm.
D．Where the largest snowflakes can be found.
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