单项选择题

Why does the author mention a dog's bark

A．It is a type of memory.
B．It is a type of interruption.
C．Dogs have better memories than humans.
D．A dog's bark is similar to a doorbell.
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单项选择题
The U. S. Constitution requires that the president should be a _______ year-old native born American citizen, living in the States for 14 years.
A．25
B．35
C．45
D．40
单项选择题
The author writes the development of geology to demonstrate ______.
A．the process of specialization and professionalisation
B．the hardship of amateurs in scientific study
C．the change of policies in scientific publications
D．the discrimination of professionals against amateurs
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