单项选择题

A．A traffic guard.
B．A sociologist.
C．A student.
D．A librarian.
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单项选择题
A．Japanese students study much harder than Columbian students.B．Columbian students score higher than Japanese students in ninths.C．Columbian students are more optimistic about their maths skills.D．Japanese students have better conditions for study.
A．Japanese students study much harder than Columbian students.
B．Columbian students score higher than Japanese students in ninths.
C．Columbian students are more optimistic about their maths skills.
D．Japanese students have better conditions for study.
单项选择题
A．By forcing them farming.B．By affecting the quality of mils.C．By adding chemicals and pollute the waterways.D．By affecting the environments they live in.
A．By forcing them farming.
B．By affecting the quality of mils.
C．By adding chemicals and pollute the waterways.
D．By affecting the environments they live in.
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