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61．学生会打算举办一场旧书交换活动。请你给全校同学写一份通知，内容包括：

·旧书交换的好处（如培养节约习惯、增强环保意识等）；

·旧书交换活动的时间及地点；

·可以交换的旧书类别（如课本、小说等）；

·号召大家积极参与。

Why were people encouraged to participate in the Big Butterfly Count?

• A、To understand anxiety.

• B、To connect with others.

• C、To find new butterfly species.

• D、To help with a science project.

What were people concerned about according to the surveys?

• A、Their inability to gather enough dat

• B、The decrease in butterfly populations.

• C、Their anxiety in doing the surveys.

• D、The duration of the counting task.