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.
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填空题
By saying ideas often become obsolete overnight (Line 2, Para.1), the author means ______.
单项选择题
A．There’s a big problem.B．There’s not a big problem.C．It’s too bad to be fixed.D．There’s nothing wrong with it.
A．There’s a big problem.
B．There’s not a big problem.
C．It’s too bad to be fixed.
D．There’s nothing wrong with it.
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