A、He felt puzzled at the students' being late.
B、He felt angry at the students' rudeness.
C、He wanted to make the students come on time later.
D、He wanted to collect data for one of his studies.
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试题解析
52.答案为A 从第一段美国教授在巴西的经历可看出,他对巴西学生的表现很困惑,因此A为最佳选项。