Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
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 spend about one-third of our lives sleeping so that we know relatively little about sleep.
C.Despite spending about one-third of our lives sleeping, we know relatively little about sleep.
D.We shall know more about sleep if we spend more than one-third of our lives sleeping.

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