单项选择题

Rivers have been important to man ______.

A．since the last century
B．for a very long time
C．since a few years ago
D．since a few hundred years ago
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单项选择题
Key time is a period when ______.
A．visitors come to the plants
B．all workers must be at work
C．employers go round in the workshops
D．rush hours are over
单项选择题
One of the main advantages of Flextime for workers is that they ______.
A．have a greater sense of duty
B．can avoid busy traffic
C．can get higher pay
D．can avoid working hard
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