WE SPEND ABOUT ONE-THIRD OF OUR LIVES SLEEPING. WE KNOW REL...

Câu 49: We spend about one-third of our lives sleeping. We know relatively little about sleep. A.We spend about one-third of our lives sleeping so that we know relatively little B.Despite spending about one-third of our lives sleeping. C.We shall know more about sleep if we spend more than one-third of our lives sleeping. D.We know relatively little about sleep; as a result, we spend about one-third of our lives sleeping.