单项选择题

A．Three weeks.
B．Nine weeks.
C．Five weeks.
D．Ten weeks.
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单项选择题
A．Every 2 years.B．Whenever one dies or must resign.C．Every 6 years.D．Every 4 years like the president.
A．Every 2 years.
B．Whenever one dies or must resign.
C．Every 6 years.
D．Every 4 years like the president.
单项选择题
A．By forcing them farming.B．By affecting the quality of soils.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 soils.
C．By adding chemicals and pollute the waterways.
D．By affecting the environments they live in.
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