单项选择题

A．20.
B．25.
C．35.
D．45
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单项选择题
Digital technologies really began to take form when _______.
A．DVD technology was introduced
B．it was used with photography
C．used in computing
D．information was encoded
单项选择题
Slightly less than a third of CO2 emissions in the United States are caused by deforestation.
A．Y
B．N
C．NG
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