Giải bởi Vietjack
Giải thích:
Trong mệnh đề quan hệ:
- that: thay thế cho danh từ chỉ người và vật, không đứng sau dấu “,”
- whom: thay thế cho danh từ chỉ người đóng vai trò làm tân ngữ
- which: thay thế cho danh từ chỉ vật
- whose + N: thay thế cho tính từ sở hữu
Dấu hiệu: trước chỗ trống là dấu “,” => loại A, D.
Cần điền đại từ quan hệ thay thế cho cụm từ chỉ vật “the production of melatonin” => dùng “which”.
With respect to adverse health effects, many species, especially humans, are dependent on natural body cycles, and the production of melatonin, (7) which are regulated by light and dark (e.g., day and night).
Tạm dịch: Đối với các tác động xấu đến sức khỏe của nhiều loài, đặc biệt là con người, phụ thuộc vào chu kỳ cơ thể tự nhiên và việc sản xuất melatonin, được điều chỉnh bởi ánh sáng và bóng tối (ví dụ, ngày và đêm).
Chọn C.
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