单项选择题

Questions 15～18 are based on the following dialogue. Where is this conversation taking place

A．In a classroom.
B．In a library.
C．At a secondhand bookstore.
D．In a museum.
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单项选择题
Why couldn’t the man open the door
A．His friend gave him the wrong key,
B．He didn’t know where the back door was.
C．He couldn’t find the key to his mailbox.
D．It was too dark to put file key in the lock.
单项选择题
A．powerB．timeC．heatD．temperature
A．power
B．time
C．heat
D．temperature
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