单项选择题

A．They became more poplar.
B．They were more regulated.
C．They became better produced.
D．They became less honest.
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单项选择题
A．They are big and aggressive.B．They provide companionship as well as protection.C．Most people are afraid of them.D．They are easy to train.
A．They are big and aggressive.
B．They provide companionship as well as protection.
C．Most people are afraid of them.
D．They are easy to train.
填空题
By saying ideas often become obsolete overnight (Line 2, Para.1), the author means ______.
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