单项选择题

A．To collect some materials about cultures of a certain area.
B．To write a topic about her senior paper.
C．To make a research about the Amazon River.
D．To research an incidence.
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单项选择题
A．Because she is the best gymnasts in the country.B．Because she has been practicing gymnastics since she was very young.C．Because she has the talent for gymnastics.D．Because she is always serious about all kinds of classes.
A．Because she is the best gymnasts in the country.
B．Because she has been practicing gymnastics since she was very young.
C．Because she has the talent for gymnastics.
D．Because she is always serious about all kinds of classes.
单项选择题
A．What people used in building their houses.B．What people grew in the land.C．How people defended themselves against threats.D．How people fought rains and storms.
A．What people used in building their houses.
B．What people grew in the land.
C．How people defended themselves against threats.
D．How people fought rains and storms.
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