单项选择题

Very few people could understand the lecture the professor delivered because its subject was very _______.

A．obscure
B．indefinite
C．dubious
D．intriguing
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单项选择题
In this factory the machines are not regulated _______ but are jointly controlled by a central computer system.
A．independently
B．individually
C．irrespectively
D．irregularly
单项选择题
The design of this auditorium shows a great deal of _______. We have never seen such abuilding before.
A．invention
B．illusion
C．originality
D．orientation
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