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A．The United States Copyright Office created it.
B．It does not protect artists’ techniques and procedures.
C．It has not been changed since its creation.
D．It is applied only to copies of the original work.
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单项选择题
A．They were evident in the decreased world temperature.B．They were of several days’ duration worldwide.C．They were felt mainly in the Dutch East Indies.D．They were immediately evident to the world’s scientists.
A．They were evident in the decreased world temperature.
B．They were of several days’ duration worldwide.
C．They were felt mainly in the Dutch East Indies.
D．They were immediately evident to the world’s scientists.
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