单项选择题

Questions 19-22 are based on the following dialogue: How many solar heat panels do three or four-bedroom homes usually need

A．Three or four.
B．Five or six.
C．Seven or eight.
D．Twelve or more.
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单项选择题
Where is Dr. Brown now
A．In his office.
B．At home.
C．Not sure.
D．In New York.
单项选择题
What does the man say about dolphin intelligence
A．It is limited.
B．It is greater than human intelligence.
C．It is less than previously thought.
D．They are beginning to learn how much they have.
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