Which word in Paragraph 6 tells us that older adults were divided into groups in the human studies? A) Corresponding. B) Inactive. C) Older. D) Faster.

Which word in Paragraph 6 tells us that older adults were divided into groups in the human studies?

A) Corresponding. B) Inactive. C) Older. D) Faster.

出自：河南城建学院-大学英语2

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