单项选择题

It is also because new technologies that have improved industrial productivity have made ______ and layoffs possible as well.

A．lessened
B．lessening
C．downsizing
D．downsized
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单项选择题
In the service of knowledge, scientists also train the most skilled component of the work force ______ to the employers.
A．in no cases
B．in a case
C．at no cost
D．at a cost
单项选择题
Second, interactivity: readers can adjust how they look at web pages, they can respond immediately to what they are reading, and we can quickly react to ______.
A．a response
B．no response
C．this response
D．that response
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