单项选择题


A．very
B．obviously
C．extremely
D．too
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单项选择题
A．dateB．orderC．contactD．touch
A．date
B．order
C．contact
D．touch
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
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