单项选择题

The landscape of the American West was dramatically altered during the 20th century as a result of the () construction of dams along major rivers.

A. degenerative
B. widespread
C. advancing
D. extensive

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Advance in food preservation gave consumers in developed countries access to () all foods grown in distant lands.

A. extensively
B. virtually
C. artificially
D. continually
单项选择题
A completely new situation will () when the new examination system comes into existence.

A. rise
B. raise
C. arise
D. arouse
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