单项选择题

How long is the holiday in a year

A．Two weeks.
B．Three weeks.
C．Four weeks.
D．Five weeks.
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单项选择题
How is Mr. Brown’s study
A．He got A for every subject.
B．His Art was A.
C．He didn’t get on with his subject.
D．He just got a pass.
单项选择题
The author refers to the ocean bottom as a frontier in Paragraph 1 because it ______.
A．is not a popular area for scientific research
B．contains a wide variety of life forms
C．attracts brave explorers
D．is an unknown field
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