单项选择题

Economics ______ among the college students.

A. is one of the basic courses
B. is the basic courses
C. are the basic courses
D. are one of the basic courses
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单项选择题
May I have two ______ instead of beans, please
A. corn s ear
B. corn ears
C. ears of corn
D. ear of corns
单项选择题
The country’s wealth comes chiefly from its ______.
A. herd of cattle
B. herd of cattles
C. herds of cattle
D. herds of cattles
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