We spend about one-third of our lives sleeping. We know relatively little about our sleep. A. We shall know more about our sleep if we spend more than one-third of our lives sleeping. B. We

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We spend about one-third of our lives sleeping. We know relatively little about our sleep.

We shall know more about our sleep if we spend more than one-third of our lives sleeping.

We know relatively little about our sleep; as a result, we spend about one-third of our lives sleeping.

Despite spending about one-third of our lives sleeping, we know relatively little about our sleep.

We spend about one-third of our lives sleeping so that we know relatively little about our sleep.

Giải thích

Đáp án C.

Tạm dịch: Mặc dù dành 1/3 quãng đời của mình để ngủ, chúng ta biết rất ít về giấc ngủ của mình.

Đáp án A, B, D sai nghĩa.