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
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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
单项选择题
Today's scientists are no longer constrained simply by the laws of nature, ______ in the past, but also by the laws (and attitudes) of the land.
A．as generally the case
B．as was generally the case
C．as long ago
D．as expected
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