We spend about one-third of our lives sleeping. We know relatively little about sleep.
A. We know relatively little about sleep; as a result, we spend about one-third of our lives sleeping.
B. We shall know more about sleep if we spend more than one-third of our lives sleeping.
C. Despite spending about one-third of our lives sleeping, we know relatively little about sleep.
D. We spend about one-third of our lives sleeping so that we know relatively little about sleep.
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Đáp án C
Despite spending anout one-third of our lives sleeping, we know relatively little about sleep: “Mặc dầu một phần ba thời gian của cuộc đời để ngủ, chúng ta lại biết tương đối ít ỏi về giấc ngủ”, cách này nối hai mệnh đề thích hợp và có ý nghĩa nhất.
Câu A, B và D có ý nghĩa trái ngược và không hợp lí.
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