The word they in paragraph 2 refers to ______.
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This question belongs to "Đề Thi Thử Tốt Nghiệp Tiếng Anh 2026 THPT Lê Trọng Tấn TP HCM" on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.
Question detail
The word "they" in paragraph 2 refers to ______.
A
devices
B
users
C
heart rates
D
insights
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