单项选择题

The most important and largest river in the United States of America is ______.

A. the Ohio River
B. the Colorado River
C. the Missouri River
D. the Mississippi River
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单项选择题
Which of the following is NOT a design feature of human language
A. Competence.
B. Arbitrariness.
C. Displacement.
D. Productivity.
单项选择题
The first American president elected from the Republican Party was ______.
A. Thomas Jefferson
B. James Monroe
C. James Madison
D. Abraham Lincoln
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