单项选择题

A．There have been three major changes in TV technology since 1927.
B．Basic TV technology nowadays is quite different from that of the first TV set.
C．Digital TV sets incorporate computer technology.
D．Digital TV technology originated in the U. S.
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单项选择题
A．Being on sick leave.B．Staying in hospital for further tests.C．Changing his job.D．Taking some new medications.
A．Being on sick leave.
B．Staying in hospital for further tests.
C．Changing his job.
D．Taking some new medications.
单项选择题
A．Politicians.B．Clerks.C．Manual workers.D．Lawyers.
A．Politicians.
B．Clerks.
C．Manual workers.
D．Lawyers.
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