单项选择题

This university offers a wide variety of high-quality ______ courses for both graduate and undergraduate students.

A．select
B．choice
C．alternative
D．optional
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单项选择题
There are still some ______ for students of science and engineering, but those in arts and humanities have been filled.
A．positions
B．vacancies
C．applications
D．categories
单项选择题
There is scientific evidence to support our ______ that being surrounded by plants is good for health.
A．instinct
B．implication
C．perception
D．conception
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