单项选择题

（）, the knowledge economy has become the major characteristic of the national economy of most developed countries.

A．Once in a while
B．For the time being
C．From time to time
D．Once upon a time

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单项选择题
What do we know about the man（）

A．He’s a pupil.
B．He’s a teacher.
C．He’s a college student.
D．He’s a worker.
单项选择题
We can infer that the author's attitude towards the robotic companion is（）

A．suspicious
B．confused
C．optimistic
D．disagreeing
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