单项选择题

A．There aren’’t many varieties of food at lunch counters.
B．Some school kids eat in school cafeterias.
C．Workers go back home to have lunch.
D．The woman likes American food. Section B
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单项选择题
Nitrogen is one of noxious gases.
A．Y
B．N
C．NG
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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