单项选择题


A．date
B．order
C．contact
D．touch
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单项选择题
The concentration of carbon dioxide is caused by_______.
A．the heat accumulated in the atmosphere
B．the burning of coal
C．the wide use of renewable energy
D．the destruction of the tropical rain forest
单项选择题
A．toB．withC．onD．for
A．to
B．with
C．on
D．for
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