单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A. She felt embarrassed in class.
B. Her presentation received a poor grade.
C. She had not completed her assignment.
D. She was unable to attend her psychology class.
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单项选择题
A. Introduction to a Canadian engineer. B. Invention of a new type of computer. C. Treatment of carpal tunnel syndrome patients. D. Development of a nose-driven mouse.
A. Introduction to a Canadian engineer.
B. Invention of a new type of computer.
C. Treatment of carpal tunnel syndrome patients.
D. Development of a nose-driven mouse.
单项选择题
A. To keep the animals under control. B. To have music for the visitors. C. To provide the animals with special sound effects of their natural surroundings. D. To record the conversations of the visitors.
A. To keep the animals under control.
B. To have music for the visitors.
C. To provide the animals with special sound effects of their natural surroundings.
D. To record the conversations of the visitors.
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