单项选择题

A．The effects of caffeine.
B．Some causes of headaches.
C．How to do well on exams.
D．Problems with the student cafeteria.
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单项选择题
A．It is in the heart of the city at 42nd Street and Fifth Avenue.B．It is in the heart of the city at 42nd Street and Sixth Avenue.C．It is in the heart of the city at 5nd Street and 42nd Avenue.D．It is in the heart of the city at 6nd Street and 42nd Avenue.
A．It is in the heart of the city at 42nd Street and Fifth Avenue.
B．It is in the heart of the city at 42nd Street and Sixth Avenue.
C．It is in the heart of the city at 5nd Street and 42nd Avenue.
D．It is in the heart of the city at 6nd Street and 42nd Avenue.
单项选择题
A．Small and lightweight.B．Solid and heavy.C．Bulky but weightless.D．Large but necessary.
A．Small and lightweight.
B．Solid and heavy.
C．Bulky but weightless.
D．Large but necessary.
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