单项选择题

The underlined word "elapses" in paragraph 1 is closest in meaning to ______.

A．passes
B．adds up
C．appears
D．continues
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单项选择题
Why does the author mention doorbell rings
A．It is a type of information.
B．It is a type of break.
C．It is a type of incentive.
D．It is a type of warning.
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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