单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A. On a bicycle trip.
B. To a recycling center.
C. To a paper mill.
D. On a business trip.

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Some people thought that NASA acted out the Apollo program in movie studios partially because the pictures transmitted from the moon do not include （）

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Two elderly men from Wiltshire County claimed in 1991 that they were （） the crop circles, but the debate still rages today.

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