20. What can be the main idea of the passage? A) Two groups of people participated in an experiment. B) Light-colored rooms make students do better on the exams. C) People in nice-looking rooms tend to be biased in their opinion.

20. What can be the main idea of the passage?
A) Two groups of people participated in an experiment.
B) Light-colored rooms make students do better on the exams.
C) People in nice-looking rooms tend to be biased in their opinion.

出自：西安石油大学-大学英语2

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