单项选择题

Under the influence of market economy some research activities have been______ from basic research towards practical goals.

A．relayed
B．revolved
C．diverted
D．rectified
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单项选择题
The writer suggests that there is no sense in buying the latest volume______.
A．because it is not worth the price
B．because it has fewer entries than before
C．unless one has all the volumes in the collection
D．unless an expanded DNB will come out shortly
单项选择题
The main subject of this passage is______.
A．transportation and storage
B．storage of products
C．distribution center
D．two main aspects of product distribution
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