单项选择题

Why must the workers wear thick glasses


A. To see clearly.
B. To protect them from dust.
C. To protect them from bad light.
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单项选择题
What are they talking about
A. They are talking about building a house.
B. They are talking about their modern house.
C. They are talking about making things.
单项选择题
Where are they talking
[A] In a bank.
B. In a hotel.
C. In a post office.
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