单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．The science block.
B．The library.
C．The maths block.
D．The west block.
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单项选择题
A．50%.B．20%.C．30%.D．all of it.
A．50%.
B．20%.
C．30%.
D．all of it.
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