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信息发布者：

作业精灵老师示例：

a:--What is this?--It is an orange.

b:--What are these?--They are oranges.

a:—What are these? --They are ducks.

b:--What are those? --They are ducks.

a:--What is that?--It's a dog.

b:--What are these?--They are dogs.

a:--What is this?--It's a bird.

b:--What are those?--They are birds.

four

pears

six

oranges

five

chickens

two

cows

one

duck

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