单项选择题

A．Because it keeps you calm.
B．Because it strengthens your memory.
C．Because it stimulates your nerve activity.
D．Because it improves your problem solving strategies.
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单项选择题
A．20.B．25.C．35.D．45
A．20.
B．25.
C．35.
D．45
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
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