单项选择题

Some companies have introduced flexible working time with less emphasis on pressure ______.

A．than more on efficiency
B．and more on efficiency
C．and more efficiency
D．than efficiency
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单项选择题
Modern ______ perhaps causes more problems than it solves.
A．technique
B．technology
C．tactics
D．tendency
单项选择题
The ______ crown jewels are kept in the Tower of London.
A．valued
B．valueless
C．invaluable
D．usable
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