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

There are numerous studies showing that, in an efficient market, returns from stocks are determined by two factors, interest rates and the effectiveness of economic projects ______.the enterprises whose shares investors purchase.

A．underlined in
B．undergone through
C．undermined by
D．undertaken by

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