单项选择题

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单项选择题
A. Less than 30 minutes. B. From 30 to 45 minutes. C. At least 45 minutes. D. More than 45 minutes.
A. Less than 30 minutes. B. From 30 to 45 minutes.
C. At least 45 minutes. D. More than 45 minutes.
单项选择题
A. Current issues in economics. B. Choices faced by conservationists.C. A recent biology lecture. D. Topics for a research paper.
A. Current issues in economics.
B. Choices faced by conservationists.
C. A recent biology lecture.
D. Topics for a research paper.
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