单项选择题

Questions 17-20 are based on the following passage about U. S. universities. You now have 20 seconds to read the questions 17-20. In a big university, what may several thousand students be taking at the same time

A．Arts and sciences.
B．Geometry.
C．A compulsory course.
D．A course in poultry marketing.

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单项选择题

单项选择题

Questions 17-20 are based on the following passage about U. S. universities. You now have 20 seconds to read the questions 17-20. In a big university, what may several thousand students be taking at the same time 您的浏览器不支持 audio 元素。