单项选择题

The word "core" ( 1st paragraph) might mean ______.

A．aim
B．unit
C．center
D．course
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单项选择题
It can be inferred from the passage that high-quality college education calls for ______.
A．high-quality faculties
B．a commitment to students and effective teaching
C．the cultivation of students' interest in learning
D．dedication to research in frontier areas of knowledge
单项选择题
When the author calls Antarctica distant-early-warning sensor , he actually means that ______.
A．such equipment has been set up for scientific purpose
B．the research groups there are like such kind of sensors
C．potential global changes can be seen on Antarctica first
D．Antarctica is remote from other parts of the earth
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