单项选择题

What can be inferred about the swallows mentioned in the conversation

A．They are a type of insect.
B．They are a kind of fish.
C．They are a type of bird.
D．They are a type of pi
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单项选择题
There is no easy solution to Japan's labor （）.

A、decline
B、vacancy
C、rarity
D、shortage
单项选择题
My dentist suggested that I have my tooth ______
A．detracted
B．retracted
C．protracted
D．extracted
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