MARK THE LETTER A,B,C,OR D ON YOUR ANSWER SHEET TO INDICATE THE SENTE...

Câu 19: 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 question.

We spent 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.

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

D.

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