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This is
one ___.
These are
many ___.
pencil
pencils
chair
chairs
girl
duck
apple
house
girls
ducks
apples
houses
This is a box.
This is a bus.
These are
many boxes.
These are
many buses.
How many ( ) are there?
可数名词
复数
This is
a ___.
These are
many ___.
box