单项选择题

In 1861, it seemed odd that the Southern states would break away from the Union.

A. strange
B. certain
C. inconsistent
D. proper
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I warned him to keep the matter confidential.
A. private
B. safe
C. personal
D. secret
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America's emphasis on the importance of education for everyone has spurred scientific research.
A. encouraged
B. endangered
C. endorsed
D. enlarged
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