单项选择题

A．He has lost his history book.
B．He doesn’t like the history course.
C．He has to read a lot of history books.
D．He finds history books difficult to understand.
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填空题
Dr. Peter Diot believes that it may be effective to use ARVs to ________________.
单项选择题
A．Rise.B．Fall.C．V-shape.D．Zigzag.
A．Rise.
B．Fall.
C．V-shape.
D．Zigzag.
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