单项选择题

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

A．Five lessons.
B．Three lessons.
C．Twelve lessons.
D．Fifteen lessons.
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单项选择题
A．ButB．ForC．StillD．And
A．But
B．For
C．Still
D．And
单项选择题
A．equivalentB．parallelC．similarD．identical
A．equivalent
B．parallel
C．similar
D．identical
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