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 is the man doing（）

A．Talking about clothes with his friend.
B．Doing shopping with his friend.
C．Receiving a gift from his friend.
D．Chatting with his friend.
单项选择题
Which city are they talking about（）

A．Tianjin.
B．Chongqing.
C．Shanghai.
D．Beijing.
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