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【判断题】
在UFO单元中的数据类型只有型、数值型和字符型三种。（ ）A.
正确
B.
错误
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】Why does the professor mention workers' unions?
A.
To give an example of the instructional role of guilds.
B.
To correct a common misconception about guilds.
C.
To explain that guilds still exist in the modern world.
D.
To acknowledge that they share limited similarities with guilds.
【简答题】一个国家的民主程度直接取决于一个国家的，但又间接取决于这个国家人民的文化程度、——发展的程度。
【单选题】Why is the process of instructional development essential in distance education?
A.
Because instructors and students have limited common background.
B.
Because it can facilitate every stage of the distance instruction.
C.
Because the majority follow the same stages of instruction.
D.
Because teacher and students have minimal face-to-face contact.
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