Despite their limitation, however, these systems may eliminateor significantly reducethe costs that companies face when using privately owned electronic networks, making it difficult for smaller companies to afford EDI.()

We should（）this opportunity to find a good job.

A.take care of
B.take advantage of
C.take part in
D.take note of

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Non-gaseous substances which（）naturally as pure elements，such as gold，are rare and are often highly valued.

A.happen
B.perceive
C.occur
D.assume

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