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[听力原文]28-30 Man’s first real invention, and one of the most ......

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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 pig.
单项选择题
A．Fifty students.B．Forty students.C．Twenty-five students.D．Fifteen students.
A．Fifty students.
B．Forty students.
C．Twenty-five students.
D．Fifteen students.
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